diff --git a/examples/symba_mars_disk/aescattermovie.py b/examples/symba_mars_disk/aescattermovie.py
index c91296c63..f4da3762e 100755
--- a/examples/symba_mars_disk/aescattermovie.py
+++ b/examples/symba_mars_disk/aescattermovie.py
@@ -86,7 +86,7 @@ def data_stream(self, frame=0):
             a = d['a'].values / self.Rcb
             e = d['e'].values
             name = d['id'].values
-            npl = d.id.count().values
+            npl = d['npl'].values[0]
             radmarker = d['radmarker']
             origin = d['origin_type'].values