netcdf files/g/d093001/1991/ipv650.l.gdas.199108.grb2 {
  dimensions:
    lon = 144;
    lat = 73;
    time = 744;
    isentrope = 1;
  variables:
    int LatLon_Projection;
      :grid_mapping_name = "latitude_longitude";
      :earth_radius = 6371229.0; // double

    float lat(lat=73);
      :units = "degrees_north";

    float lon(lon=144);
      :units = "degrees_east";

    double time(time=744);
      :units = "Hour since 1991-08-01T00:00:00Z";
      :standard_name = "time";
      :long_name = "GRIB forecast or observation time";
      :calendar = "proleptic_gregorian";

    double reftime(time=744);
      :standard_name = "forecast_reference_time";
      :long_name = "GRIB reference time";
      :calendar = "proleptic_gregorian";
      :units = "Hour since 1991-08-01T00:00:00Z";

    float isentrope(isentrope=1);
      :units = "K";
      :long_name = "Isentropic (theta) level";
      :positive = "up";
      :Grib_level_type = 107; // int

    float Potential_vorticity_isentrope(time=744, isentrope=1, lat=73, lon=144);
      :long_name = "Potential vorticity @ Isentropic (theta) level";
      :units = "K.m2.kg-1.s-1";
      :abbreviation = "PVORT";
      :missing_value = NaNf; // float
      :grid_mapping = "LatLon_Projection";
      :coordinates = "reftime time isentrope lat lon ";
      :Grib_Variable_Id = "VAR_0-2-14_L107";
      :Grib2_Parameter = 0, 2, 14; // int
      :Grib2_Parameter_Discipline = "Meteorological products";
      :Grib2_Parameter_Category = "Momentum";
      :Grib2_Parameter_Name = "Potential vorticity";
      :Grib2_Level_Type = 107; // int
      :Grib2_Level_Desc = "Isentropic (theta) level";
      :Grib2_Generating_Process_Type = "Forecast";
      :Grib2_Statistical_Process_Type = "UnknownStatType--1";

  // global attributes:
  :Originating_or_generating_Center = "US National Weather Service, National Centres for Environmental Prediction (NCEP)";
  :Originating_or_generating_Subcenter = "0";
  :GRIB_table_version = "2,1";
  :Type_of_generating_process = "Forecast";
  :Analysis_or_forecast_generating_process_identifier_defined_by_originating_centre = "Analysis from GDAS (Global Data Assimilation System)";
  :file_format = "GRIB-2";
  :Conventions = "CF-1.6";
  :history = "Read using CDM IOSP GribCollection v3";
  :featureType = "GRID";
}