TICLABELS

       Create tic labels for labeling astronomical images.

       Used to display images with right ascension or declination
       axes.  This routine creates labels for already determined tic
       marks (every other tic mark by default)

       TICLABELS, minval, numtics, incr, ticlabs, [ RA = ,DELTA = ]

       minval  - minimum value for labels (degrees)
       numtics - number of tic marks
       incr    - increment in minutes for labels

       ticlabs - array of charater string labels

       /RA - if this keyword is set then the grid axis is assumed to be
               a Right Ascension.   Otherwise a declination axis is assumed
       DELTA - Scalar specifying spacing of labels.   The default is
               DELTA = 2 which means that a label is made for every other tic
               mark.  Set DELTA=1 to create a label for every tic mark.

       RADEC

       Invalid for wide field (> 2 degree) images since it assumes that a
       fixed interval in Y (or X) corresponds to a fixed interval in Dec
       (or RA)

       written by B. Pfarr, 4/15/87
       Added DELTA keywrd for compatibility with IMCONTOUR W. Landsman Nov 1991
       Added nicer hms and dms symbols when using native PS fonts Deutsch 11/92
       Added Patch for bug in IDL <2.4.0 as explained in NOTES E. Deutsch 11/92
       Fix when crossing 0 dec or 24h RA
       Fix DELTA keyword so that it behaves according to the documentation
                       W. Landsman  Hughes STX,  Nov 95
       Converted to IDL V5.0   W. Landsman   September 1997
       Allow sub arcsecond formatting  W. Landsman   May 2000
       Better formatting for non-unity DELTA values  W. Landsamn July 2004

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