FXBFINDLUN()

       Find logical unit number UNIT in FXBINTABLE common block.

       Finds the proper index to use for getting information about the logical
       unit number UNIT in the arrays stored in the FXBINTABLE common block.
       Called from FXBCREATE and FXBOPEN.

       Result = FXBFINDLUN( UNIT )

       UNIT    = Logical unit number.

       None.

       The result of the function is an index into the FXBINTABLE common
       block.

       None.

       None.

       None.

       Uses common block FXBINTABLE--see "fxbintable.pro" for more
       information.

       None.

       If UNIT is not found in the common block, then it is added to the
       common block.

       Data Handling, I/O, FITS, Generic.

       William Thompson, Feb. 1992.

       William Thompson, GSFC, February 1992.

       Version 1, William Thompson, GSFC, 12 April 1993.
               Incorporated into CDS library.
       Version 2, William Thompson, GSFC, 21 July 1993.
               Added DHEAP variable to fix bug with variable length arrays.
       Version 3, Michael Schubnell, University of Michigan, 22 May 1996
               Change N_DIMS from short to long integer.

       Version 3, 22 May 1996
       Converted to IDL V5.0   W. Landsman   September 1997

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