dimensions:
   xc = 128 ;
   yc = 64 ;
   lev = 18 ;
 variables:
   float T(lev,yc,xc) ;
     T:long_name = "temperature" ;
     T:units = "K" ;
     T:coordinates = "lon lat" ;
   float xc(xc) ;
     xc:axis="X";
     xc:long_name = "x-coordinate in Cartesian system" ;
     xc:units = "m" ;
   float yc(yc) ;
     yc:axis="Y";
     yc:long_name = "y-coordinate in Cartesian system" ;
     yc:units = "m" ;
   float lev(lev) ;
     lev:long_name = "pressure level" ;
     lev:units = "hPa" ;
   float lon(yc,xc) ;
     lon:long_name = "longitude" ;
     lon:units = "degrees_east" ;
   float lat(yc,xc) ;
     lat:long_name = "latitude" ;
     lat:units = "degrees_north" ;