The SHL is a one-dimensional array with a length equal to a line of science
data. It contains a copy of the uppermost words of the UDL data. SHL files are
identified by the extensions ``.X0H'' and ``.X0D''.
icd_19: Wed May 29 16:36:33 EDT 1996: (pappas@stsci.edu)Updated: 05/29/96 04:42
