The $partialdiff sub T$ root mean sq [ NOAA NCEP-NCAR CDAS-1 mc6190 Intrinsic MSL pressure ] data are available as a columnar table,
i.e. as multiple columns of data, intended primarily to be read. However,
if you have other intentions for this table, or simply do not like the default choices, you may want to choose from the columnar tables with options.