=> ncdump -h main_netcdf_file.nc 
    netcdf main_netcdf_file {
    dimensions:
        time = 5 ;
    variables:
        double time(time) ;
            time:units = "seconds since 19700101T00:00:00" ;
            time:long_name = "time" ;
        double sea_level(time) ;
            sea_level:_FillValue = -9999. ;
            sea_level:category = "TEST" ;
            sea_level:scale_factor = 1. ;
            sea_level:add_offset = 0. ;
            sea_level:long_name = "sea level" ;
            sea_level:units = "mm" ;
        double corrected_sea_level(time) ;
            corrected_sea_level:_FillValue = -9999. ;
            corrected_sea_level:units = "mm" ;
            corrected_sea_level:add_offset = 0. ;
            corrected_sea_level:scale_factor = 1. ;
            corrected_sea_level:long_name = "corr sea level" ;

    // global attributes:
            :Conventions = "CF-1.0" ;
            :history = "the netcdf file has been created by EGADS" ;
            :comments = "no comments on the netcdf file" ;
            :institution = "My institution" ;
    }
