CALL SEQUENCE...
       spresol  SPIN SPOUT INPUT OUTPUT [ -lrlmt VAL0 -kind VAL1 ]
 
 
      DESCRIPTION...
       spresol - EXTRACTS LOWER RESOLUTION SUB-SET FROM SPECTRAL FILE 
  
 
      AUTHOR  - S.LAMBERT, NOV 1979.
      LAST REVISION: $Header: /home/cvs/RMNLIB/utils/rdiag/lspgm/spresol.ptn,v 4.9 2014/09/25 20:20:54 dugas Exp $
 
  
      PURPOSE - RETURNS IN SPOUT FILE A LOWER SPECTRAL RESOLUTION SUB-SET OF 
                THE INPUT GLOBAL SPHERICAL HARMONIC COEFFICIENTS IN SPIN FILE 
  
 
      INPUT FILE... 
       SPIN  = GLOBAL SPECTRAL FIELDS 
  
      OUTPUT FILE... 
       SPOUT = GLOBAL SPECTRAL FIELDS WITH LOWER SPECTRAL RESOLUTION 
  
 
      INPUT PARAMETERS... 
  
       LRLMT = ONE NUMBER CONTAINING THE REQUIRED RESOLUTION. 
               THIS NUMBER CONTAINS SEVEN DIGITS... 
               LR = FIRST  THREE DIGITS = M TRUNCATION 
               LM = SECOND THREE DIGITS = N TRUNCATION 
               T  = TYPE OF TRUNCATION (0=RHOMBOIDAL,2=TRIANGULAR). 
       KIND  = 0 ==> GLOBAL COEFFICIENTS INPUT
             < 0 ==> ANTI-SYMMETRIC COEFFICIENTS
             > 0 ==> SYMMETRIC COEFFICIENTS
 
       READ( 5,5000 ) LRLMT,KIND
 5000  FORMAT(10X,I10,I5) 
 
 
      EXAMPLE OF INPUT CARD... 
  
   SPRESOL    150152    0
  
         0123456789012345678901234567890123456789012345678901234567890
         1         2         3         4         5         6         7
 
      THIS EXTRACTS SPECTRAL FIELDS WITH 14 WAVES IN THE M AND N 
      DIRECTIONS AND WITH GLOBAL TRIANGULAR TRUNCATION. 
 
 
      EXIT CONDITIONS...
        0 NO PROBLEMS
 
      FATAL CONDITIONS...
        1 ERROR READING OUTSP
        2 INPUT ARRAY INCONSISTENT WITH KIND
        3 ERROR READING INPUT
 
      NON-FATAL CONDITIONS...
      101 INSUFFICIENT ZONAL WAVE RESOLUTION IN SPIN
      102 INSUFFICIENT RESOLUTION IN SPIN