ABSCISSA

alters abscissa fields in a Midas data file header

<file>          Name of input file
<start value>   New abscissa start value
<increment>     New abscissa increment value

DEPRECATED: Use HEADERMOD

<increment> is the double precision increment between consecutive points or 
number of current abscissa increments (integer) by which current start abscissa
should be changed.

ABSCISSA accepts any type class or data format.  The header is not modified if 
its write protect field is set to TRUE.