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Doug- Yes, for netcdf classic files, the unlimited dimension has only a single value and all variables using that dimension are padded to the same length. You can define multiple unlimited variables in netcdf-4 and while each individual dimension will have a fixed length, different unlimited dimensions will not. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: UDB-426902 Department: Support netCDF Priority: Critical Status: Open