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Adds a column to a binary table extension.


Modify a basic FITS binary table extension (BINTABLE) header array to
define a column.




HEADER = String array containing FITS extension header.
ARRAY = IDL variable used to determine the data size and type
associated with the column. If the column is defined as
containing variable length arrays, then ARRAY must be of the
maximum size to be stored in the column.
  Opt. Inputs :
TTYPE = Column label.
COMMENT = Comment for TTYPE


INDEX = Index (1-999) of the created column.
HEADER = The header is modified to reflect the added column.
  Opt. Outputs:


VARIABLE= If set, then the column is defined to contain pointers to
variable length arrays in the heap area.
DCOMPLEX= If set, and ARRAY is complex, with the first dimension being
two (real and imaginary parts), then the column is defined as
double-precision complex (type "M"). This keyword is
only needed prior to IDL Version 4.0, when the double
double complex datatype was unavailable in IDL
BIT = If passed, and ARRAY is of type byte, then the column is
defined as containing bit mask arrays (type "X"), with the
value of BIT being equal to the number of mask bits.
LOGICAL = If set, and array is of type byte, then the column is defined
as containing logical arrays (type "L").
NO_TDIM = If set, then the TDIMn keyword is not written out to the
header. No TDIMn keywords are written for columns containing
variable length arrays.
TUNIT = If passed, then corresponding keyword is added to header.
TSCAL = Same.
TZERO = Same.
TNULL = Same.
TDISP = Same.
TDMIN = Same.
TDMAX = Same.
TDESC = Same.
TCUNI = Same.
TROTA = Same.
TRPIX = Same.
TRVAL = Same.
TDELT = Same.
ERRMSG = If defined and passed, then any error messages will be
returned to the user in this parameter rather than
depending on the MESSAGE routine in IDL. If no errors are
encountered, then a null string is returned. In order to
use this feature, ERRMSG must be defined first, e.g.


  Common :


Warning: No checking is done of any of the parameters defining the
values of optional FITS keywords.
FXBHMAKE must first be called to initialize the header.
If ARRAY is of type character, then it must be of the maximum length
expected for this column. If a character string array, then the
largest string in the array is used to determine the maximum length.
The DCOMPLEX keyword is ignored if ARRAY is not double-precision.
ARRAY must also have a first dimension of two representing the real and
imaginary parts.
The BIT and LOGICAL keywords are ignored if ARRAY is not of type byte.
BIT takes precedence over LOGICAL.

Side Effects

If the data array is multidimensional, then a TDIM keyword is added to
the header, unless either NO_TDIM or VARIABLE is set.
No TDIMn keywords are written out for bit arrays (format 'X'), since
the dimensions would refer to bits, not bytes.


Data Handling, I/O, FITS, Generic.
  Prev. Hist. :
William Thompson, Jan 1992.
W. Thompson, Feb 1992, changed from function to procedure.
W. Thompson, Feb 1992, modified to support variable length arrays.
  Written :
William Thompson, GSFC, January 1992.
  Modified :
Version 1, William Thompson, GSFC, 12 April 1993.
Incorporated into CDS library.
Version 2, William Thompson, GSFC, 31 May 1994
Added ERRMSG keyword.
      Version 3, William Thompson, GSFC, 23 June 1994
              Modified so that ERRMSG is not touched if not defined.
Version 4, William Thompson, GSFC, 30 December 1994
Added keyword TCUNI.
Version 5, Wayne Landsman, GSFC, 12 Aug 1997
Recognize double complex IDL datatype
      Version 6, Wayne Landsman, GSFC. C. Yamauchi (ISAS) 23 Feb 2006
              Support 64bit integers
      Version 7, C. Markwardt, GSFC, Allow unsigned integers, which
              have special TSCAL/TZERO values. Feb 2009
      Version 8, P.Broos (PSU), Wayne Landsman (GSFC) Mar 2010
              Do *not* force TTYPE* keyword to uppercase


      Version 8, Mar 2010

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