netcdf files/g/ds193.0/ERA40/ERA40_T2M_1979-06.nc {
  dimensions:
    lat = 360;
    lon = 720;
    time = UNLIMITED;   // (720 currently)
  variables:
    double time(time=720);
      :long_name = "time";
      :units = "days since 1979-06-01 00:00:00";

    float lat(lat=360);
      :units = "degrees_north";
      :long_name = "latitude";

    float lon(lon=720);
      :units = "degrees_east";
      :long_name = "longitude";

    float T2M(time=720, lat=360, lon=720);
      :long_name = "2 meter air temperature";
      :units = "K";
      :_FillValue = -999.0f; // float

  // global attributes:
  :source_file = "This product is developed based on ERA-40 6-hourly reanalysis products and CRU TS3.10 datasets  ";
  :institution = "A. Wang is at the Institute of Atmospheric Physics in Beijing, China, and X. Zeng is at the University of Arizona in Tucson, Arizona, USA";
  :references = " Wang and Zeng, 2013, J. Climate, Volume: 26, Pages:7676-7691, doi:http://dx.doi.org/10.1175/JCLI-D-12-00682.1";
}