Constant used with the YFORMAT or XFORMAT Controls to define the
format of the values displayed for each fiducial on a PLOT, and
the format used for the data value fields output by the PRINT and
WRITE procedures.

     keyword   Displayed Format
     -------   ----------------
     NOMINAL   floating point numbers.
     DATES     dates in the form mm/dd/yy.
     HOURS     time values in the form hh:mm:ss.
