diff --git a/dgpy/scripts/slimPre.py b/dgpy/scripts/slimPre.py
index f28741ec1c923369667a20350018c9d4f2af8837..f20cb74189cc6755a5b77fb5489cad9d12938ae6 100644
--- a/dgpy/scripts/slimPre.py
+++ b/dgpy/scripts/slimPre.py
@@ -403,14 +403,18 @@ def netcdf_to_msh(mesh_file_name, nc_file_name, variable_name, export_file_name,
     * variable_name 
         name of the variable in the netcdf file
     * export_file_name 
-        path to the field name (.msh format)
+        path to the field name (.idx format)
     * time  
         time at which the data will be exported in msh format (default: 0)
     """
     groups = dgpy.dgGroupCollection(mesh_file_name)
     f = slim_private._load_function((nc_file_name,variable_name),groups)
     dgpy.function.getTime().set(time)
-    groups.exportFunctionMsh(f, export_file_name)
+    dof = dgpy.dgDofContainer(groups, 1)
+    dof.interpolate(f)
+    exporter = dgpy.dgIdxExporter(dof, export_file_name)
+    exporter.exportIdx()
+    #groups.exportFunctionMsh(f, export_file_name)
 
 def read_temporal_serie(file_name, time=None, output_netcdf=None):
     """Return a temporal serie from a text data file.