netcdf ncep/rtma/202509/202509_rtma_pt.nc {
  dimensions:
    t = UNLIMITED;   // (0 currently)
    y = UNLIMITED;   // (0 currently)
    x = UNLIMITED;   // (0 currently)
  variables:
    float longitude(y=0, x=0);
      :_ChunkSizes = 2048U, 2048U; // uint

    float time(t=0);
      :_CoordinateAxisType = "Time";
      :calendar = "gregorian";
      :units = "hours 2025-09-03 00:00";
      :long_name = "time";
      :_ChunkSizes = 1024U; // uint

    float latitude(y=0, x=0);
      :_ChunkSizes = 2048U, 2048U; // uint

  // global attributes:
}