char* sdoc[] = {
 SEGYHDRMOD - replace the text header on a SEGY file		

   segyhdrmod text=file data=file				

   Required parameters:					

   text=      name of file containing new 3200 byte text header
   data=      name of file containing SEGY data set		



====================================================================*\

   sgyhdrmod - replace the text header on a SEGY data file in place

   This program only reads and writes 3200 bytes

   Reginald H. Beardsley                            rhb@acm.org

\*====================================================================*/