CALL SEQUENCE...
       zdhdiv  ZXIN ZDH ZXOUT
 
 
      DESCRIPTION...
       zdhdiv  - ZONAL CROSS-SECTION DELTA-HAT DIVIDER
 
 
      AUTHOR  - J.D.Henderson, NOV 1980.
      LAST REVISION: $Header: /home/cvs/RMNLIB/utils/rdiag/lspgm/zdhdiv.ptn,v 4.8 2014/09/25 20:20:56 dugas Exp $
 
 
      PURPOSE - DIVIDES A CROSS-SECTION BY THE ZONAL MEAN OF DELTA-HAT.
 
      NOTE    - ANY VALUE DIVIDED BY ZERO IS SIMPLY SET TO ZERO.
 
 
      INPUT FILES...
       ZXIN  = ONE ZONAL CROSS-SECTION
       ZDH   = ZONAL MEAN OF DELTA-HAT
 
      OUTPUT FILE...
       ZXOUT = THE QUOTIENT ZXIN/ZDH  (ZXIN/0=0)
 
 
      EXIT CONDITIONS...
        0 NO PROBLEMS
        1 UNABLE TO READ FIRST SETS
        2 ZXIN AND ZDH ARRAYS ARE NOT THE SAME SIZE
        3 DATA IS NOT ZONAL
        4 NOT THE SAME NUMBER OF RECORDS IN ZXIN AND ZDH