     PRINT *,' usage : cdfclip -f IN-file -zoom imin imax jmin jmax [kmin kmax] '
     PRINT *,'      '
     PRINT *,'     PURPOSE :'
     PRINT *,'       Clip the input file according to the indices given in the'
     PRINT *,'       zoom statement. If no vertical zoomed area is indicated, ' 
     PRINT *,'       the whole water column is considered.  This program is able'
     PRINT *,'       to extract data for a region crossing the E-W periodic boundary'
     PRINT *,'       of a global configuration. It does so if imax < imin.'
     PRINT *,'      '
     PRINT *,'     ARGUMENTS :'
     PRINT *,'       -f IN-file : specify the input file to be clipped' 
     PRINT *,'       -zoom imin imax jmin jmax : specify the domain to be extracted.'
     PRINT *,'           If imin=imax, or jmin = jmax assume a vertical section either '
     PRINT *,'           meridional or zonal.'
     PRINT *,'      '
     PRINT *,'     OPTIONS :'
     PRINT *,'       [kmin kmax ] : specify vertical limits for the zoom, in order to reduce'
     PRINT *,'               the extracted area to some levels. Default is to take the whole' 
     PRINT *,'               water column.'
     PRINT *,'      '
     PRINT *,'     REQUIRED FILES :'
     PRINT *,'       none' 
     PRINT *,'      '
     PRINT *,'     OUTPUT : '
     PRINT *,'       netcdf file : ', TRIM(cf_out) 
     PRINT *,'         variables : same as input variables.'
