TBHELP

       Routine to print a description of a FITS binary table header

       TBHELP, h, [TEXTOUT = ]

       h - FITS header for a binary table, string array

       TEXTOUT - scalar number (0-7) or string (file name) controling
               output device (see TEXTOPEN).  Default is TEXTOUT=1, output
               to the user's terminal

       FITS Binary Table keywords NAXIS*,EXTNAME,TFIELDS,TTYPE*,TFORM*,TUNIT*,
       are read from the header and displayed at the terminal
       A FITS header is recognized as bein for a binary table if the keyword
       XTENSION has the value 'BINTABLE' or 'A3DTABLE'

       Certain fields may be truncated in the display

       Uses the non-standard system variables !TEXTOUT and !TEXTUNIT.   These
       are automatically defined by TBHELP if they have not been defined
       previously.

       REMCHAR, SXPAR(), TEXTCLOSE, TEXTOPEN, ZPARCHECK

       W. Landsman       February, 1991
       Parsing of a FITS binary header made more robust    May, 1992
       Added TEXTOUT keyword      August 1997
       Converted to IDL V5.0   W. Landsman   September 1997
       Define !TEXTOUT if not already present   W. Landsman  November 2002

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