diff --git a/modules/aeolus/datasource.py b/modules/aeolus/datasource.py
index e96422b9dd8db5b0801cdf7cb2224c951232893d..6d396b8976fe4c90893b4c41ee51b50362d07b22 100644
--- a/modules/aeolus/datasource.py
+++ b/modules/aeolus/datasource.py
@@ -37,17 +37,19 @@ def get_parameters_caliop_clavrx(filename='/data/Personal/rink/clavrx_calipso/g1
     rg = Dataset(filename, 'r')
     var_s = rg.variables
     var_names = list(var_s.keys())
-    var_names_2d = []
+    var_names_keep = []
 
     for str in var_names:
         v = var_s[str]
         if len(v.shape) == 1:
             print(str)
             if not (str.find('latitude') != -1 or str.find('longitude') != -1):
-                var_names_2d.append(str)
+                var_names_keep.append(str)
 
     rg.close()
 
+    return var_names_keep
+
 
 def get_parameters_fmwk_amvs(filename='/ships19/cloud/scratch/4TH_AMV_INTERCOMPARISON/FMWK2_AMV/GOES16_ABI_2KM_FD_2019293_0020_34_WINDS_AMV_EN-14CT.nc'):
     rg = Dataset(filename, 'r')