function listtablecolumns

List FITS binary table column names of specified extension in a FITS file

Syntax
result = listtablecolumns(fname, extension)

Arguments

fname: A string containing the FITS file name

extension: Which extension to read, either an integer number >= 1, or a string with the EXTNAME

Returns
A string array with all FITS binary table column names

fname:	A string containing the FITS file name
extension:	Which extension to read, either an integer number >= 1, or a string with the EXTNAME