FTAB_HELP

       Describe the columns of a FITS binary or ASCII table extension.

       FTAB_HELP, filename, [ EXTEN_No = , TEXTOUT= ]
               or
       FTAB_HELP, fcb, [EXTEN_No=, TEXTOUT= ]

       filename - scalar string giving name of the FITS file.
       fcb - FITS control block returned by a previous call to FITS_OPEN

       EXTEN_NO - integer scalar specifying which FITS extension to read.
               Default is to display the first FITS extension.
       TEXTOUT - scalar number (0-7) or string (file name) determining
               output device (see TEXTOPEN).  Default is TEXTOUT=1, output
               to the user's terminal

       Describe the columns in the second extension of a FITS file spec.fits
       and write the results to a file 'spec2.lis'
       IDL> ftab_help,'spec.fits',exten=2,t='spec2.lis'

       Uses the non-standard system variables !TEXTOUT and !TEXTUNIT
       which must be defined (e.g. with ASTROLIB) before compilation

       FITS_READ, FITS_CLOSE, FITS_OPEN, FTHELP, TBHELP, TEXTOPEN, TEXTCLOSE

       version 1  W. Landsman    August 1997
       Converted to IDL V5.0   W. Landsman   September 1997
       Corrected documentation W. Landsman   September 1997
       Don't call fits_close if fcb supplied W. Landsman May 2001

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