Esteban, So far all the Grib files I have worked with only have one set of data values per parameter. If the data provider wanted to have multiple values per parameter they would of created an ensemble type of parameter. Inspecting the index you sent, there is only one data set per parameter and there are no ensemble type of parameters. If you provide a sample dataset, I'll look into it in detail. Robb... Ticket Details =================== Ticket ID: NTS-432886 Department: Support netCDF Decoders Priority: Normal Status: Open