diff --git a/examples/symba_gr_test/init_cond.py b/examples/symba_gr_test/init_cond.py
index 2639272e7..a5dbe9118 100755
--- a/examples/symba_gr_test/init_cond.py
+++ b/examples/symba_gr_test/init_cond.py
@@ -1,5 +1,7 @@
 #!/usr/bin/env python3
 import swiftest
+from numpy.random import default_rng
+import numpy as np
 
 sim = swiftest.Simulation()
 sim.param['PL_IN'] = "pl.swiftest.in"
@@ -43,7 +45,30 @@
 
 for name, id in bodyid.items():
    sim.add(name, idval=id, date="2027-04-30")
-   
+
+Me_a = sim.ds.isel(id=1)['a'].values
+Me_e = sim.ds.sel(id=1)['e'].values
+Me_i = sim.ds.sel(id=1)['inc'].values
+
+capom_pl = default_rng().uniform(0.0, 360.0, 1)
+omega_pl = default_rng().uniform(0.0, 360.0, 1)
+capm_pl = default_rng().uniform(0.0, 360.0, 1)
+
+capom_tp = default_rng().uniform(0.0, 360.0, 1)
+omega_tp = default_rng().uniform(0.0, 360.0, 1)
+capm_tp = default_rng().uniform(0.0, 360.0, 1)
+
+GMcb = sim.ds.isel(id=0)['Gmass'].values
+GU = swiftest.GC / (sim.param['DU2M']**3 / (sim.param['MU2KG'] * sim.param['TU2S']**2))
+dens = 3000.0 / (sim.param['MU2KG'] / sim.param['DU2M']**3) # Assume a bulk density of 3 g/cm^3
+GM_pl = 2e-7
+M_pl = GM_pl / GU
+R_pl = (3 * M_pl / (4 * np.pi * dens))**(1.0 / 3.0)
+Rh_pl = Me_a * (GM_pl / (3 * GMcb))**(1.0/3.0)
+
+sim.addp(np.full(1,9), np.full(1,'Planetesimal'), Me_a, Me_e, Me_i, capom_pl, omega_pl, capm_pl, GMpl=np.full(1, GM_pl), Rpl=np.full(1, R_pl), rhill=Rh_pl)
+sim.addp(np.full(1,10), np.full(1,'TestParticle'), Me_a, Me_e, Me_i, capom_tp, omega_tp, capm_tp)
+
 sim.save("param.swiftest.in")
 sim.param['PL_IN'] = "pl.swifter.in"
 sim.param['TP_IN'] = "tp.swifter.in"
diff --git a/examples/symba_gr_test/pl.swifter.in b/examples/symba_gr_test/pl.swifter.in
index dffe532c6..869b2fc13 100644
--- a/examples/symba_gr_test/pl.swifter.in
+++ b/examples/symba_gr_test/pl.swifter.in
@@ -1,36 +1,40 @@
-9
+10
 0 39.476926408897626
 0.0 0.0 0.0
 0.0 0.0 0.0
-1 6.5537098095653139645e-06 0.0014751260185578720416
+1 6.553709809565314146e-06 0.0014751260185578724335
 1.6306381826061645943e-05
 0.22527006614756858727 0.22185515636479818946 -0.0025292250509892700606
 -9.2410583833491193135 7.7546860001024244665 1.481285384055779404
-2 9.663313399581537916e-05 0.006759120024335718617
+2 9.6633133995815381836e-05 0.0067591200243357198168
 4.0453784346544178454e-05
 0.6401338616632904488 -0.3439628247287493945 -0.041662537354174501714
 3.4536908505004217623 6.4771489080253446934 -0.110257596056190005656
-3 0.000120026935827952453094 0.0100446292823340959596
+3 0.000120026935827952456416 0.010044629282334098766
 4.25875607065040958e-05
 -0.7819504386201725499 -0.6346854491951327004 4.4451463454996458186e-05
 3.8578491980751480153 -4.9026737310919641898 0.0002888700847309900442
-4 1.2739802010675941456e-05 0.0072466212625671651507
+4 1.2739802010675941808e-05 0.0072466212625671666944
 2.265740805092889601e-05
 -1.6500171831673979828 -0.023341429362091121319 0.039964339661466272147
 0.2624112744618213919 -4.673688782463607376 -0.10439239110136837694
-5 0.037692251088985676735 0.35521688466465032753
+5 0.03769225108898567778 0.35521688466465040944
 0.00046732617030490929307
 -4.540785007788180394 2.8642873711036669349 0.08969619001756239107
 -1.5037012644183387769 -2.204631616790602934 0.042803317383791750652
-6 0.011285899820091272997 0.43538665458575465117
+6 0.01128589982009127331 0.43538665458575473606
 0.00038925687730393611812
 8.9010680046292307566 2.902848867584423953 -0.40487415052930197934
 -0.7439396408265333407 1.9316851317225221362 -0.004029214768814220126
-7 0.0017236589478267730203 0.46987236554736915505
+7 0.001723658947826773068 0.46987236554736924745
 0.00016953449859497231466
 8.1785533453299539275 17.594789418581910923 -0.04069518248189726156
 -1.3149276792509819067 0.53722869521767089375 0.019051745273498437594
-8 0.0020336100526728302319 0.7749718408665498732
+8 0.0020336100526728302882 0.7749718408665500834
 0.000164587904124493665
 29.794198627119580891 2.0446309861539178065 -0.7287194786837880578
 -0.08754730406665780868 1.1492225523523839664 -0.021678684633280679721
+9 1.9999999999999999095e-07 0.0004609743061784924374
+6.20967433941813041e-06
+nan nan nan
+nan nan nan
diff --git a/examples/symba_gr_test/pl.swiftest.in b/examples/symba_gr_test/pl.swiftest.in
index 37ebc69a0..1c629790f 100644
--- a/examples/symba_gr_test/pl.swiftest.in
+++ b/examples/symba_gr_test/pl.swiftest.in
@@ -1,33 +1,37 @@
-8
-Mercury 6.5537098095653139645e-06 0.0014751260185578720416
+9
+Mercury 6.553709809565314146e-06 0.0014751260185578724335
 1.6306381826061645943e-05
 0.38709858430953941744 0.20562340108970009189 7.0033025080013837638
 48.296118373786072198 29.20442403952453958 338.33948746828792764
-Venus 9.663313399581537916e-05 0.006759120024335718617
+Venus 9.6633133995815381836e-05 0.0067591200243357198168
 4.0453784346544178454e-05
 0.72332975797361009906 0.006717605698865438367 3.3944392733422819042
 76.60235891771118588 54.960379460829607012 200.47893395506480374
-Earth 0.000120026935827952453094 0.0100446292823340959596
+Earth 0.000120026935827952456416 0.010044629282334098766
 4.25875607065040958e-05
 0.99999048745432228547 0.016714003765458580048 0.0036378626088630029375
 175.0251726002310022 287.96196288125747742 114.34829340424269617
-Mars 1.2739802010675941456e-05 0.0072466212625671651507
+Mars 1.2739802010675941808e-05 0.0072466212625671666944
 2.265740805092889601e-05
 1.5237119255895350545 0.09344151133508207807 1.8474416735579008986
 49.47285721247470036 286.7379771285890797 209.33967734771380265
-Jupiter 0.037692251088985676735 0.35521688466465032753
+Jupiter 0.03769225108898567778 0.35521688466465040944
 0.00046732617030490929307
 5.202727800851599582 0.048244977116379678117 1.3036311345700750675
 100.51925884330809424 273.58984028825142332 129.5536700659941971
-Saturn 0.011285899820091272997 0.43538665458575465117
+Saturn 0.01128589982009127331 0.43538665458575473606
 0.00038925687730393611812
 9.532011952667287957 0.054863298704333408884 2.4879063632803011252
 113.63057816762059815 339.54673564023909194 290.89958065689040723
-Uranus 0.0017236589478267730203 0.46987236554736915505
+Uranus 0.001723658947826773068 0.46987236554736924745
 0.00016953449859497231466
 19.244988382902359803 0.0479617494230129629 0.7730102596086204647
 74.012580980165793676 93.595549122802268016 262.86586372775150267
-Neptune 0.0020336100526728302319 0.7749718408665498732
+Neptune 0.0020336100526728302882 0.7749718408665500834
 0.000164587904124493665
 30.038959912561129073 0.008955570159296157365 1.7711193542961420899
 131.82211597488270627 284.47484279411258967 308.45137222693909962
+Planetesimal 1.9999999999999999095e-07 0.0004609743061784924374
+6.20967433941813041e-06
+0.38709858430953941744 0.20562340108970009189 7.0033025080013837638
+96.63690427760462853 41.241157268984508733 305.79195407738086487
diff --git a/examples/symba_gr_test/tp.swifter.in b/examples/symba_gr_test/tp.swifter.in
index 573541ac9..eec5bc877 100644
--- a/examples/symba_gr_test/tp.swifter.in
+++ b/examples/symba_gr_test/tp.swifter.in
@@ -1 +1,4 @@
-0
+1
+10
+nan nan nan
+nan nan nan
diff --git a/examples/symba_gr_test/tp.swiftest.in b/examples/symba_gr_test/tp.swiftest.in
index 573541ac9..427febb15 100644
--- a/examples/symba_gr_test/tp.swiftest.in
+++ b/examples/symba_gr_test/tp.swiftest.in
@@ -1 +1,4 @@
-0
+1
+TestParticle
+0.38709858430953941744 0.20562340108970009189 7.0033025080013837638
+91.57330105121243946 163.58917166648961938 345.1110833758885974