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Hi Alan, The last dimensions varies fastest, as is described in the "NetCDF Utilities" chapter of the netCDF Users Guide: The optional data section of a CDL description is where netCDF variables may be initialized. The syntax of an initialization is simple: variable = value_1, value_2, ...; The comma-delimited list of constants may be separated by spaces, tabs, and newlines. For multidimensional arrays, the last dimension varies fastest. Thus, row-order rather than column order is used for matrices. ... http://www.unidata.ucar.edu/software/netcdf/docs/netcdf.html#NetCDF-Utilities You can always use the annotation arguments [-b lang] or [-f lang] for brief or full annotation in comments relative to C or Fortran index order to see what the values correspond to, as in ncdump -f fortran foo.nc --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: TWZ-216539 Department: Support netCDF Priority: Normal Status: Closed