diff --git a/examples/whm_gr_test/swiftest_relativity.ipynb b/examples/whm_gr_test/swiftest_relativity.ipynb
index 0cd73753f..6abb9524a 100644
--- a/examples/whm_gr_test/swiftest_relativity.ipynb
+++ b/examples/whm_gr_test/swiftest_relativity.ipynb
@@ -2,7 +2,7 @@
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@@ -15,913 +15,48 @@
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-      "Creating the Sun as a central body\n",
-      "Fetching ephemerides data for Mercury from JPL/Horizons\n",
-      "Fetching ephemerides data for Venus from JPL/Horizons\n",
-      "Fetching ephemerides data for Earth from JPL/Horizons\n",
-      "Fetching ephemerides data for Mars from JPL/Horizons\n",
-      "Fetching ephemerides data for Jupiter from JPL/Horizons\n",
-      "Fetching ephemerides data for Saturn from JPL/Horizons\n",
-      "Fetching ephemerides data for Uranus from JPL/Horizons\n",
-      "Fetching ephemerides data for Neptune from JPL/Horizons\n",
-      "Writing initial conditions to file init_cond.nc\n",
-      "Writing parameter inputs to file /home/daminton/git_debug/swiftest/examples/whm_gr_test/param.gr.in\n"
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-       "    ntp            (time) int64 0\n",
-       "    npl            (time) int64 8</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-24d5c828-505c-4d47-a614-260f11ab60e8' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-24d5c828-505c-4d47-a614-260f11ab60e8' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span class='xr-has-index'>name</span>: 9</li><li><span class='xr-has-index'>time</span>: 1</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-e65fdf23-7fa6-463b-8c33-4d685235e3c1' class='xr-section-summary-in' type='checkbox'  checked><label for='section-e65fdf23-7fa6-463b-8c33-4d685235e3c1' class='xr-section-summary' >Coordinates: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>name</span></div><div class='xr-var-dims'>(name)</div><div class='xr-var-dtype'>&lt;U32</div><div class='xr-var-preview xr-preview'>&#x27;Sun&#x27; &#x27;Mercury&#x27; ... &#x27;Neptune&#x27;</div><input id='attrs-3dd7d645-9a3a-465a-9aec-e33a094581f5' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-3dd7d645-9a3a-465a-9aec-e33a094581f5' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-7e27bd85-b58d-4960-bbc7-470a6aecc028' class='xr-var-data-in' type='checkbox'><label for='data-7e27bd85-b58d-4960-bbc7-470a6aecc028' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([&#x27;Sun&#x27;, &#x27;Mercury&#x27;, &#x27;Venus&#x27;, &#x27;Earth&#x27;, &#x27;Mars&#x27;, &#x27;Jupiter&#x27;, &#x27;Saturn&#x27;,\n",
-       "       &#x27;Uranus&#x27;, &#x27;Neptune&#x27;], dtype=&#x27;&lt;U32&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-b4a3d6b1-2b75-4297-bf70-48da66a4b964' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-b4a3d6b1-2b75-4297-bf70-48da66a4b964' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a71efd79-b820-49ee-8910-7abffc2245d4' class='xr-var-data-in' type='checkbox'><label for='data-a71efd79-b820-49ee-8910-7abffc2245d4' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([0.])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-3e8ed869-d3c1-46b5-936f-5868089ab757' class='xr-section-summary-in' type='checkbox'  checked><label for='section-3e8ed869-d3c1-46b5-936f-5868089ab757' class='xr-section-summary' >Data variables: <span>(14)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>particle_type</span></div><div class='xr-var-dims'>(name)</div><div class='xr-var-dtype'>&lt;U32</div><div class='xr-var-preview xr-preview'>&#x27;Central Body&#x27; ... &#x27;Massive Body&#x27;</div><input id='attrs-5c29c659-755d-4b25-9ccf-5ddca9477b90' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-5c29c659-755d-4b25-9ccf-5ddca9477b90' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-b362f92d-189f-4cec-9a4b-e14e53e1fd71' class='xr-var-data-in' type='checkbox'><label for='data-b362f92d-189f-4cec-9a4b-e14e53e1fd71' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([&#x27;Central Body&#x27;, &#x27;Massive Body&#x27;, &#x27;Massive Body&#x27;, &#x27;Massive Body&#x27;,\n",
-       "       &#x27;Massive Body&#x27;, &#x27;Massive Body&#x27;, &#x27;Massive Body&#x27;, &#x27;Massive Body&#x27;,\n",
-       "       &#x27;Massive Body&#x27;], dtype=&#x27;&lt;U32&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>id</span></div><div class='xr-var-dims'>(name)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>0 1 2 3 4 5 6 7 8</div><input id='attrs-17057a19-fc7b-4f57-a907-307688a3d827' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-17057a19-fc7b-4f57-a907-307688a3d827' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-88d0c856-39ee-439c-8c3a-936f9e89c31e' class='xr-var-data-in' type='checkbox'><label for='data-88d0c856-39ee-439c-8c3a-936f9e89c31e' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([0, 1, 2, 3, 4, 5, 6, 7, 8])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>Gmass</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>39.48 6.554e-06 ... 0.002034</div><input id='attrs-6d157615-df32-4456-99e1-3025ad081179' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-6d157615-df32-4456-99e1-3025ad081179' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-295255e7-c548-4cdc-85a4-68f371490789' class='xr-var-data-in' type='checkbox'><label for='data-295255e7-c548-4cdc-85a4-68f371490789' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[3.94769264e+01, 6.55370981e-06, 9.66331340e-05, 1.20026936e-04,\n",
-       "        1.27398020e-05, 3.76922511e-02, 1.12858998e-02, 1.72365895e-03,\n",
-       "        2.03361005e-03]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>radius</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.00465 1.631e-05 ... 0.0001646</div><input id='attrs-f0d7810e-7d03-44bd-8ed8-fc7457626c50' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-f0d7810e-7d03-44bd-8ed8-fc7457626c50' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-8001a5f4-8347-4cf3-a8c0-95abd2255899' class='xr-var-data-in' type='checkbox'><label for='data-8001a5f4-8347-4cf3-a8c0-95abd2255899' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[4.65046726e-03, 1.63063818e-05, 4.04537843e-05, 4.25875607e-05,\n",
-       "        2.26574081e-05, 4.67326170e-04, 3.89256877e-04, 1.69534499e-04,\n",
-       "        1.64587904e-04]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>j2rp2</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>4.754e-12 nan nan ... nan nan nan</div><input id='attrs-33b47d88-61a7-4217-8ea5-d53d8d634250' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-33b47d88-61a7-4217-8ea5-d53d8d634250' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-63782b0e-891a-4ba3-8c91-6c14e0ec41f0' class='xr-var-data-in' type='checkbox'><label for='data-63782b0e-891a-4ba3-8c91-6c14e0ec41f0' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[4.75358069e-12,            nan,            nan,            nan,\n",
-       "                   nan,            nan,            nan,            nan,\n",
-       "                   nan]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>j4rp4</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-2.247e-18 nan nan ... nan nan nan</div><input id='attrs-61761cd0-dc1b-4d13-92b8-024d302fa9a4' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-61761cd0-dc1b-4d13-92b8-024d302fa9a4' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-72df4131-dc97-4743-8ada-7685342dfb6d' class='xr-var-data-in' type='checkbox'><label for='data-72df4131-dc97-4743-8ada-7685342dfb6d' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[-2.2473968e-18,            nan,            nan,            nan,\n",
-       "                   nan,            nan,            nan,            nan,\n",
-       "                   nan]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>xhx</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan 0.2253 0.6401 ... 8.179 29.79</div><input id='attrs-f8306230-bcf9-4567-aa23-4c5325265873' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-f8306230-bcf9-4567-aa23-4c5325265873' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-ea9f1018-9788-43ae-8173-9f3a7211d02c' class='xr-var-data-in' type='checkbox'><label for='data-ea9f1018-9788-43ae-8173-9f3a7211d02c' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[        nan,  0.22527007,  0.64013386, -0.78195044, -1.65001718,\n",
-       "        -4.54078501,  8.901068  ,  8.17855335, 29.79419863]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>xhy</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan 0.2219 -0.344 ... 17.59 2.045</div><input id='attrs-7fb81775-bdd5-4e9f-bb12-d24f02d7ab5b' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-7fb81775-bdd5-4e9f-bb12-d24f02d7ab5b' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-399a26fb-56ce-4398-9079-ac72c4f0b820' class='xr-var-data-in' type='checkbox'><label for='data-399a26fb-56ce-4398-9079-ac72c4f0b820' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[        nan,  0.22185516, -0.34396282, -0.63468545, -0.02334143,\n",
-       "         2.86428737,  2.90284887, 17.59478942,  2.04463099]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>xhz</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan -0.002529 ... -0.0407 -0.7287</div><input id='attrs-33a79169-b3ba-44d4-87ec-56af9d188c8f' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-33a79169-b3ba-44d4-87ec-56af9d188c8f' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-4a1f3a63-a2c5-4ce3-bf66-edc66e22eadf' class='xr-var-data-in' type='checkbox'><label for='data-4a1f3a63-a2c5-4ce3-bf66-edc66e22eadf' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[            nan, -2.52922505e-03, -4.16625374e-02,\n",
-       "         4.44514635e-05,  3.99643397e-02,  8.96961900e-02,\n",
-       "        -4.04874151e-01, -4.06951825e-02, -7.28719479e-01]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>vhx</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan -9.241 ... -1.315 -0.08755</div><input id='attrs-d5a383c3-7d7c-400a-9d70-36fadc5ad33e' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-d5a383c3-7d7c-400a-9d70-36fadc5ad33e' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-98014e22-9102-4da4-a8d7-8dc2ceb91b20' class='xr-var-data-in' type='checkbox'><label for='data-98014e22-9102-4da4-a8d7-8dc2ceb91b20' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[        nan, -9.24105838,  3.45369085,  3.8578492 ,  0.26241127,\n",
-       "        -1.50370126, -0.74393964, -1.31492768, -0.0875473 ]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>vhy</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan 7.755 6.477 ... 0.5372 1.149</div><input id='attrs-ca1983fe-0960-4511-ac3b-7057303cc7e4' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-ca1983fe-0960-4511-ac3b-7057303cc7e4' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-74bdf30c-f36b-49ac-b4f0-f67a13abfa65' class='xr-var-data-in' type='checkbox'><label for='data-74bdf30c-f36b-49ac-b4f0-f67a13abfa65' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[        nan,  7.754686  ,  6.47714891, -4.90267373, -4.67368878,\n",
-       "        -2.20463162,  1.93168513,  0.5372287 ,  1.14922255]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>vhz</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan 1.481 ... 0.01905 -0.02168</div><input id='attrs-60504126-9290-4dcc-b5bf-a6014885a51c' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-60504126-9290-4dcc-b5bf-a6014885a51c' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-070b3756-82db-4382-afc5-c352f1bd5d42' class='xr-var-data-in' type='checkbox'><label for='data-070b3756-82db-4382-afc5-c352f1bd5d42' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[            nan,  1.48128538e+00, -1.10257596e-01,\n",
-       "         2.88870085e-04, -1.04392391e-01,  4.28033174e-02,\n",
-       "        -4.02921477e-03,  1.90517453e-02, -2.16786846e-02]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>ntp</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>0</div><input id='attrs-a68d3c53-d50b-44bb-930a-e064397ec812' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-a68d3c53-d50b-44bb-930a-e064397ec812' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-cc7e56cd-1660-4789-be77-c29e8d9ebdaf' class='xr-var-data-in' type='checkbox'><label for='data-cc7e56cd-1660-4789-be77-c29e8d9ebdaf' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([0])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>npl</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>8</div><input id='attrs-4938babb-5d6e-40b1-9df6-1e9430d96b39' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-4938babb-5d6e-40b1-9df6-1e9430d96b39' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a11f9f42-6b12-4529-ac26-740858d89b42' class='xr-var-data-in' type='checkbox'><label for='data-a11f9f42-6b12-4529-ac26-740858d89b42' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([8])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-1e288b47-016d-4588-adcc-ecd025bf5071' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-1e288b47-016d-4588-adcc-ecd025bf5071' class='xr-section-summary'  title='Expand/collapse section'>Attributes: <span>(0)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'></dl></div></li></ul></div></div>"
-      ],
-      "text/plain": [
-       "<xarray.Dataset>\n",
-       "Dimensions:        (name: 9, time: 1)\n",
-       "Coordinates:\n",
-       "  * name           (name) <U32 'Sun' 'Mercury' 'Venus' ... 'Uranus' 'Neptune'\n",
-       "  * time           (time) float64 0.0\n",
-       "Data variables: (12/14)\n",
-       "    particle_type  (name) <U32 'Central Body' 'Massive Body' ... 'Massive Body'\n",
-       "    id             (name) int64 0 1 2 3 4 5 6 7 8\n",
-       "    Gmass          (time, name) float64 39.48 6.554e-06 ... 0.001724 0.002034\n",
-       "    radius         (time, name) float64 0.00465 1.631e-05 ... 0.0001646\n",
-       "    j2rp2          (time, name) float64 4.754e-12 nan nan nan ... nan nan nan\n",
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-       "    vhx            (time, name) float64 nan -9.241 3.454 ... -1.315 -0.08755\n",
-       "    vhy            (time, name) float64 nan 7.755 6.477 ... 1.932 0.5372 1.149\n",
-       "    vhz            (time, name) float64 nan 1.481 -0.1103 ... 0.01905 -0.02168\n",
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-       "    npl            (time) int64 8"
-      ]
-     },
-     "execution_count": 2,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
+   "outputs": [],
    "source": [
-    "sim_gr = swiftest.Simulation(tstop=1000.0, dt=0.005, tstep_out=1.0, integrator=\"whm\", init_cond_format=\"XV\", general_relativity=True, param_file=\"param.gr.in\", output_file_name=\"bin.gr.nc\")\n",
+    "sim_gr = swiftest.Simulation(param_file=\"param.gr.in\", output_file_name=\"bin.gr.nc\")\n",
     "sim_gr.add_solar_system_body([\"Sun\",\"Mercury\",\"Venus\",\"Earth\",\"Mars\",\"Jupiter\",\"Saturn\",\"Uranus\",\"Neptune\"])"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Creating the Sun as a central body\n",
-      "Fetching ephemerides data for Mercury from JPL/Horizons\n",
-      "Fetching ephemerides data for Venus from JPL/Horizons\n",
-      "Fetching ephemerides data for Earth from JPL/Horizons\n",
-      "Fetching ephemerides data for Mars from JPL/Horizons\n",
-      "Fetching ephemerides data for Jupiter from JPL/Horizons\n",
-      "Fetching ephemerides data for Saturn from JPL/Horizons\n",
-      "Fetching ephemerides data for Uranus from JPL/Horizons\n",
-      "Fetching ephemerides data for Neptune from JPL/Horizons\n",
-      "Writing initial conditions to file init_cond.nc\n",
-      "Writing parameter inputs to file /home/daminton/git_debug/swiftest/examples/whm_gr_test/param.nogr.in\n"
-     ]
-    },
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-       "Dimensions:        (name: 9, time: 1)\n",
-       "Coordinates:\n",
-       "  * name           (name) &lt;U32 &#x27;Sun&#x27; &#x27;Mercury&#x27; &#x27;Venus&#x27; ... &#x27;Uranus&#x27; &#x27;Neptune&#x27;\n",
-       "  * time           (time) float64 0.0\n",
-       "Data variables: (12/14)\n",
-       "    particle_type  (name) &lt;U32 &#x27;Central Body&#x27; &#x27;Massive Body&#x27; ... &#x27;Massive Body&#x27;\n",
-       "    id             (name) int64 0 1 2 3 4 5 6 7 8\n",
-       "    Gmass          (time, name) float64 39.48 6.554e-06 ... 0.001724 0.002034\n",
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-       "    j2rp2          (time, name) float64 4.754e-12 nan nan nan ... nan nan nan\n",
-       "    j4rp4          (time, name) float64 -2.247e-18 nan nan nan ... nan nan nan\n",
-       "    ...             ...\n",
-       "    xhz            (time, name) float64 nan -0.002529 ... -0.0407 -0.7287\n",
-       "    vhx            (time, name) float64 nan -9.241 3.454 ... -1.315 -0.08755\n",
-       "    vhy            (time, name) float64 nan 7.755 6.477 ... 1.932 0.5372 1.149\n",
-       "    vhz            (time, name) float64 nan 1.481 -0.1103 ... 0.01905 -0.02168\n",
-       "    ntp            (time) int64 0\n",
-       "    npl            (time) int64 8</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-d769bb96-7cd9-40d9-ace7-2e7db8872d8d' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-d769bb96-7cd9-40d9-ace7-2e7db8872d8d' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span class='xr-has-index'>name</span>: 9</li><li><span class='xr-has-index'>time</span>: 1</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-d6545026-ba8c-4baa-b923-625ca0773cfb' class='xr-section-summary-in' type='checkbox'  checked><label for='section-d6545026-ba8c-4baa-b923-625ca0773cfb' class='xr-section-summary' >Coordinates: <span>(2)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>name</span></div><div class='xr-var-dims'>(name)</div><div class='xr-var-dtype'>&lt;U32</div><div class='xr-var-preview xr-preview'>&#x27;Sun&#x27; &#x27;Mercury&#x27; ... &#x27;Neptune&#x27;</div><input id='attrs-22fde872-9ec9-4387-b835-005227e39975' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-22fde872-9ec9-4387-b835-005227e39975' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-21b41f73-2440-4af6-a1cb-9b4ee0861917' class='xr-var-data-in' type='checkbox'><label for='data-21b41f73-2440-4af6-a1cb-9b4ee0861917' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([&#x27;Sun&#x27;, &#x27;Mercury&#x27;, &#x27;Venus&#x27;, &#x27;Earth&#x27;, &#x27;Mars&#x27;, &#x27;Jupiter&#x27;, &#x27;Saturn&#x27;,\n",
-       "       &#x27;Uranus&#x27;, &#x27;Neptune&#x27;], dtype=&#x27;&lt;U32&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.0</div><input id='attrs-c44ddd8d-965e-47ff-abd6-85dce4a3d967' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-c44ddd8d-965e-47ff-abd6-85dce4a3d967' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a953f397-3b70-4dd9-9522-11a1634a17ec' class='xr-var-data-in' type='checkbox'><label for='data-a953f397-3b70-4dd9-9522-11a1634a17ec' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([0.])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-5511f2b8-b9a0-44b2-b3fa-2326b2a6f54e' class='xr-section-summary-in' type='checkbox'  checked><label for='section-5511f2b8-b9a0-44b2-b3fa-2326b2a6f54e' class='xr-section-summary' >Data variables: <span>(14)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>particle_type</span></div><div class='xr-var-dims'>(name)</div><div class='xr-var-dtype'>&lt;U32</div><div class='xr-var-preview xr-preview'>&#x27;Central Body&#x27; ... &#x27;Massive Body&#x27;</div><input id='attrs-19f1454e-150f-426c-88f3-a87452c2e254' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-19f1454e-150f-426c-88f3-a87452c2e254' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-5b520aa1-ec07-43b1-bbf1-454ca1bad47a' class='xr-var-data-in' type='checkbox'><label for='data-5b520aa1-ec07-43b1-bbf1-454ca1bad47a' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([&#x27;Central Body&#x27;, &#x27;Massive Body&#x27;, &#x27;Massive Body&#x27;, &#x27;Massive Body&#x27;,\n",
-       "       &#x27;Massive Body&#x27;, &#x27;Massive Body&#x27;, &#x27;Massive Body&#x27;, &#x27;Massive Body&#x27;,\n",
-       "       &#x27;Massive Body&#x27;], dtype=&#x27;&lt;U32&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>id</span></div><div class='xr-var-dims'>(name)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>0 1 2 3 4 5 6 7 8</div><input id='attrs-65489649-75ff-480d-b219-68db344d9e79' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-65489649-75ff-480d-b219-68db344d9e79' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-0c72e67e-d075-4975-9f1d-af473eca1c75' class='xr-var-data-in' type='checkbox'><label for='data-0c72e67e-d075-4975-9f1d-af473eca1c75' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([0, 1, 2, 3, 4, 5, 6, 7, 8])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>Gmass</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>39.48 6.554e-06 ... 0.002034</div><input id='attrs-14bef83c-9120-4d67-a651-084feadef303' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-14bef83c-9120-4d67-a651-084feadef303' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-ffb3617e-192c-4318-81e3-8fec2cc3c6d0' class='xr-var-data-in' type='checkbox'><label for='data-ffb3617e-192c-4318-81e3-8fec2cc3c6d0' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[3.94769264e+01, 6.55370981e-06, 9.66331340e-05, 1.20026936e-04,\n",
-       "        1.27398020e-05, 3.76922511e-02, 1.12858998e-02, 1.72365895e-03,\n",
-       "        2.03361005e-03]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>radius</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.00465 1.631e-05 ... 0.0001646</div><input id='attrs-b5014045-573a-46e1-a41c-777c9f36915e' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-b5014045-573a-46e1-a41c-777c9f36915e' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-d814da83-4203-4116-a01c-984dde892660' class='xr-var-data-in' type='checkbox'><label for='data-d814da83-4203-4116-a01c-984dde892660' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[4.65046726e-03, 1.63063818e-05, 4.04537843e-05, 4.25875607e-05,\n",
-       "        2.26574081e-05, 4.67326170e-04, 3.89256877e-04, 1.69534499e-04,\n",
-       "        1.64587904e-04]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>j2rp2</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>4.754e-12 nan nan ... nan nan nan</div><input id='attrs-c86d4393-405c-4b5d-8485-cc396d181eba' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-c86d4393-405c-4b5d-8485-cc396d181eba' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-185a8e9e-f944-4754-ae8f-567702fab0ed' class='xr-var-data-in' type='checkbox'><label for='data-185a8e9e-f944-4754-ae8f-567702fab0ed' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[4.75358069e-12,            nan,            nan,            nan,\n",
-       "                   nan,            nan,            nan,            nan,\n",
-       "                   nan]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>j4rp4</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>-2.247e-18 nan nan ... nan nan nan</div><input id='attrs-aed81728-097c-4713-a51f-8753945814e4' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-aed81728-097c-4713-a51f-8753945814e4' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-21e0b433-6fad-4838-aff5-bcd405de3348' class='xr-var-data-in' type='checkbox'><label for='data-21e0b433-6fad-4838-aff5-bcd405de3348' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[-2.2473968e-18,            nan,            nan,            nan,\n",
-       "                   nan,            nan,            nan,            nan,\n",
-       "                   nan]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>xhx</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan 0.2253 0.6401 ... 8.179 29.79</div><input id='attrs-e7868fbf-d7b7-4468-8072-a49631e37c17' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-e7868fbf-d7b7-4468-8072-a49631e37c17' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-8b36c8f6-afe6-4e4c-b232-1728f99923cc' class='xr-var-data-in' type='checkbox'><label for='data-8b36c8f6-afe6-4e4c-b232-1728f99923cc' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[        nan,  0.22527007,  0.64013386, -0.78195044, -1.65001718,\n",
-       "        -4.54078501,  8.901068  ,  8.17855335, 29.79419863]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>xhy</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan 0.2219 -0.344 ... 17.59 2.045</div><input id='attrs-4357a954-e884-466f-9182-ee6a624e598a' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-4357a954-e884-466f-9182-ee6a624e598a' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-69a46900-227f-4164-a4de-8b5d75aba708' class='xr-var-data-in' type='checkbox'><label for='data-69a46900-227f-4164-a4de-8b5d75aba708' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[        nan,  0.22185516, -0.34396282, -0.63468545, -0.02334143,\n",
-       "         2.86428737,  2.90284887, 17.59478942,  2.04463099]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>xhz</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan -0.002529 ... -0.0407 -0.7287</div><input id='attrs-f75fd41a-e565-493f-871e-cd0c72d775d1' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-f75fd41a-e565-493f-871e-cd0c72d775d1' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-f0c4e898-8283-4341-bd38-1c3a027b5cee' class='xr-var-data-in' type='checkbox'><label for='data-f0c4e898-8283-4341-bd38-1c3a027b5cee' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[            nan, -2.52922505e-03, -4.16625374e-02,\n",
-       "         4.44514635e-05,  3.99643397e-02,  8.96961900e-02,\n",
-       "        -4.04874151e-01, -4.06951825e-02, -7.28719479e-01]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>vhx</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan -9.241 ... -1.315 -0.08755</div><input id='attrs-08109c76-cabf-4685-948e-5daea05d8d48' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-08109c76-cabf-4685-948e-5daea05d8d48' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-300489a9-057c-4a22-aaf7-73c009b8309b' class='xr-var-data-in' type='checkbox'><label for='data-300489a9-057c-4a22-aaf7-73c009b8309b' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[        nan, -9.24105838,  3.45369085,  3.8578492 ,  0.26241127,\n",
-       "        -1.50370126, -0.74393964, -1.31492768, -0.0875473 ]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>vhy</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan 7.755 6.477 ... 0.5372 1.149</div><input id='attrs-c196ec7b-eb87-417b-bbcc-3f9c2eb0322a' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-c196ec7b-eb87-417b-bbcc-3f9c2eb0322a' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-dcd832da-96e1-450b-88af-6f8d4d3f625b' class='xr-var-data-in' type='checkbox'><label for='data-dcd832da-96e1-450b-88af-6f8d4d3f625b' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[        nan,  7.754686  ,  6.47714891, -4.90267373, -4.67368878,\n",
-       "        -2.20463162,  1.93168513,  0.5372287 ,  1.14922255]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>vhz</span></div><div class='xr-var-dims'>(time, name)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>nan 1.481 ... 0.01905 -0.02168</div><input id='attrs-faf7ace0-e940-4bd4-a9be-9889a0d83d14' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-faf7ace0-e940-4bd4-a9be-9889a0d83d14' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-58cadf78-c580-4381-9c72-9ac771a58acd' class='xr-var-data-in' type='checkbox'><label for='data-58cadf78-c580-4381-9c72-9ac771a58acd' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([[            nan,  1.48128538e+00, -1.10257596e-01,\n",
-       "         2.88870085e-04, -1.04392391e-01,  4.28033174e-02,\n",
-       "        -4.02921477e-03,  1.90517453e-02, -2.16786846e-02]])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>ntp</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>0</div><input id='attrs-7dfc0453-f75b-4f50-80c3-46f8caa8161e' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-7dfc0453-f75b-4f50-80c3-46f8caa8161e' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-59609ae2-a58b-4815-94d1-538f74371c75' class='xr-var-data-in' type='checkbox'><label for='data-59609ae2-a58b-4815-94d1-538f74371c75' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([0])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>npl</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>8</div><input id='attrs-8a5beeb7-7143-41e4-8aaf-456a76a3ab36' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-8a5beeb7-7143-41e4-8aaf-456a76a3ab36' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a24595ea-29de-428d-8953-f77aafee4bbe' class='xr-var-data-in' type='checkbox'><label for='data-a24595ea-29de-428d-8953-f77aafee4bbe' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([8])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-4e62ee77-dfb0-4f29-aa3a-89c485de33e0' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-4e62ee77-dfb0-4f29-aa3a-89c485de33e0' class='xr-section-summary'  title='Expand/collapse section'>Attributes: <span>(0)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'></dl></div></li></ul></div></div>"
-      ],
-      "text/plain": [
-       "<xarray.Dataset>\n",
-       "Dimensions:        (name: 9, time: 1)\n",
-       "Coordinates:\n",
-       "  * name           (name) <U32 'Sun' 'Mercury' 'Venus' ... 'Uranus' 'Neptune'\n",
-       "  * time           (time) float64 0.0\n",
-       "Data variables: (12/14)\n",
-       "    particle_type  (name) <U32 'Central Body' 'Massive Body' ... 'Massive Body'\n",
-       "    id             (name) int64 0 1 2 3 4 5 6 7 8\n",
-       "    Gmass          (time, name) float64 39.48 6.554e-06 ... 0.001724 0.002034\n",
-       "    radius         (time, name) float64 0.00465 1.631e-05 ... 0.0001646\n",
-       "    j2rp2          (time, name) float64 4.754e-12 nan nan nan ... nan nan nan\n",
-       "    j4rp4          (time, name) float64 -2.247e-18 nan nan nan ... nan nan nan\n",
-       "    ...             ...\n",
-       "    xhz            (time, name) float64 nan -0.002529 ... -0.0407 -0.7287\n",
-       "    vhx            (time, name) float64 nan -9.241 3.454 ... -1.315 -0.08755\n",
-       "    vhy            (time, name) float64 nan 7.755 6.477 ... 1.932 0.5372 1.149\n",
-       "    vhz            (time, name) float64 nan 1.481 -0.1103 ... 0.01905 -0.02168\n",
-       "    ntp            (time) int64 0\n",
-       "    npl            (time) int64 8"
-      ]
-     },
-     "execution_count": 3,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
+   "outputs": [],
    "source": [
-    "sim_nogr = swiftest.Simulation(tstop=1000.0, dt=0.005, tstep_out=1.0, integrator=\"whm\", init_cond_format=\"XV\", general_relativity=False,param_file=\"param.nogr.in\", output_file_name=\"bin.nogr.nc\")\n",
+    "sim_nogr = swiftest.Simulation(param_file=\"param.nogr.in\", output_file_name=\"bin.nogr.nc\")\n",
     "sim_nogr.add_solar_system_body([\"Sun\",\"Mercury\",\"Venus\",\"Earth\",\"Mars\",\"Jupiter\",\"Saturn\",\"Uranus\",\"Neptune\"])"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
     "%%capture\n",
-    "#Capture the output of the run so it doesn't take up the whole Notebook\n",
-    "sim_gr.run()\n",
-    "sim_nogr.run()"
+    "tstep_out = 10.0\n",
+    "sim_gr.run(tstop=1000.0, dt=0.005, tstep_out=tstep_out, integrator=\"whm\",general_relativity=True)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%%capture\n",
+    "sim_nogr.run(tstop=1000.0, dt=0.005, tstep_out=tstep_out, integrator=\"whm\",general_relativity=False)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -934,14 +69,14 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
     "#Get the ephemerides of Mercury for the same timeframe as the simulation\n",
     "obj = Horizons(id='1', location='@sun',\n",
     "               epochs={'start':start_date, 'stop':stop_date,\n",
-    "                       'step':'1y'})\n",
+    "                       'step':'10y'})\n",
     "el = obj.elements()\n",
     "t = (el['datetime_jd']-el['datetime_jd'][0]) / 365.25\n",
     "varpi_obs = el['w'] + el['Omega']"
@@ -949,18 +84,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "/home/daminton/.conda/envs/cent7/2020.11-py38/swiftest/lib/python3.8/site-packages/xarray/core/computation.py:733: RuntimeWarning: invalid value encountered in remainder\n",
-      "  result_data = func(*input_data)\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "# Compute the longitude of the periapsis\n",
     "sim_gr.data['varpi'] = np.mod(sim_gr.data['omega'] + sim_gr.data['capom'],360)\n",
@@ -969,7 +95,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -980,13 +106,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
-    "dvarpi_gr = np.diff(varpisim_gr)  * 3600 * 100\n",
-    "dvarpi_nogr = np.diff(varpisim_nogr)  * 3600 * 100 \n",
-    "dvarpi_obs = np.diff(varpi_obs) / np.diff(t) * 3600 * 100 "
+    "dvarpi_gr = np.diff(varpisim_gr)  * 3600 * 100 / tstep_out\n",
+    "dvarpi_nogr = np.diff(varpisim_nogr)  * 3600 * 100 / tstep_out\n",
+    "dvarpi_obs = np.diff(varpi_obs) / np.diff(t) * 3600 * 100"
    ]
   },
   {
@@ -997,12 +123,13 @@
    "source": [
     "fig, ax = plt.subplots()\n",
     "\n",
-    "ax.plot(t, varpi_obs, label=\"JPL Horizons\")\n",
-    "ax.plot(tsim, varpisim_gr, label=\"Swiftest WHM GR\")\n",
-    "ax.plot(tsim, varpisim_nogr, label=\"Swiftest WHM No GR\")\n",
+    "ax.plot(t, varpi_obs, label=\"JPL Horizons\",linewidth=2.5)\n",
+    "ax.plot(tsim, varpisim_gr, label=\"Swiftest WHM GR\",linewidth=1.5)\n",
+    "ax.plot(tsim, varpisim_nogr, label=\"Swiftest WHM No GR\",linewidth=1.5)\n",
     "ax.set_xlabel('Time (y)')\n",
     "ax.set_ylabel('Mercury $\\\\varpi$ (deg)')\n",
     "ax.legend()\n",
+    "plt.savefig(\"whm_gr_mercury_precession.png\",dpi=300)\n",
     "print('Mean precession rate for Mercury long. peri. (arcsec/100 y)')\n",
     "print(f'JPL Horizons         : {np.mean(dvarpi_obs)}')\n",
     "print(f'Swiftest No GR       : {np.mean(dvarpi_nogr)}')\n",