extra var needed

da/tools/io4.py

@@ -153,7 +153,7 @@ class CT_CDF(netCDF4.Dataset):
 
     def AddRegionDim(self,type='eco',dimsize=None):
 
-        from da.analysis.tools_transcom import olsonlabs, transnams, ext_transnams, ext_transcomps
+        from da.analysis.tools_transcom import olsonlabs, transnams, ext_transnams, ext_transcomps, olsonnams
         from da.analysis.tools_regions import ext_econams, ext_ecocomps
 
         if type not in ['eco','eco_ext','tc','tc_ext','olson']: