Level 2 Help for GENTHIS

NL (integer) specifies the size of the image in the line direction. Default
is 10.

NS (integer) specifies the size of the image in the sample direction, i.e.,
the number of samples per line. Default is 10.

OUT is the standard VICAR output filename. It is a string of form
"name.type",where "name" is a string of alphanumeric characters,
starting with an alphabetic, and "type" is an optional string of 
alphanumeric characters. Default is GENTHIS.

This parameter specifies the data format. If it is
omitted, BYTE (unsigned INTEGER*1) data is assumed.
Valid values are:
HALF: specifies INTEGER*2 output. 
FULL: specifies INTEGER*4 output. 
REAL or REAL4: specifies REAL*4 output.
REAL8: specifies REAL*8 output. 

 The DNs are listed line after line (sequentially) with NS values for
 each line.