CALL SEQUENCE...
       spzdev  SPIN SPOUT OUTPUT
 
 
      DESCRIPTION...
       spzdev - COMPUTES SPECTRAL DEVIATION FROM ZONAL MEAN
 
 
      AUTHOR  - S.Lambert, SEP 1979.
      LAST REVISION: $Header: Autres-corrections-d-usages-de-MAXW-NWDS-modifs-dans-GGSIGN-SIGNAG @ 2018-06-05 17:00:06 -0400 (dugas) $
 
 
      PURPOSE - COMPUTES THE SPHERICAL HARMONIC COEFFICIENTS OF 
                THE DEVIATION OF A FIELD FROM ITS ZONAL MEAN
 
 
      INPUT FILE...
       SPIN  = GLOBAL SPECTRAL FIELDS.
 
      OUTPUT FILE...
       SPOUT = GLOBAL SPECTRAL FIELDS OF DEVIATIONS FROM THE ZONAL MEAN.
 
 
      EXIT CONDITIONS...
        0 NO PROBLEMS
        1 PROBLEMS READING SPIN