TICS

       Compute a nice increment between tic marks for astronomical images.

       For use in labelling a displayed image with right ascension
       or declination axes.  An approximate distance between tic
       marks is input, and a new value is computed such that the
       distance between tic marks is in simple increments of the
       tic label values.

       tics, radec_min, radec_max, numx, ticsize, incr, [ /RA ]

       radec_min - minimum axis value (degrees)
       radec_max - maximum axis value (degrees)
       numx  - number of pixels in x direction

       ticsize - distance between tic marks (pixels)

       incr    - incremental value for tic labels (in minutes of
               time for R.A., minutes of arc for dec.)

       written by B. Pfarr, 4/14/87
       Added some more tick precision (i.e. 1 & 2 seconds in case:) EWD May92
       Added sub arcsecond tick precision   W. Landsman   May 2000
       Plate scale off by 1 pixel  W. Landsman July 2004

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