% show_wcs_points --help  
show_wcs_points:
  Display the data points in a wcs data file like wcs_setup.out. This code 
is assumed to be run after the image(s) aqre already diplayed with ds9. The 
user will simply specifiy which image frame is to be used for overplotting the 
regions file (one for X,Y coordinated and one for Ra,Dec coordinates). 

Example: 
show_wcs_points wcs_setup.out red 30

arg1 - name of data file with wcs fit points (usually wcs_setup.out)
arg2 - color of the text labels to be painted 
arg3 - integer size of the text labels to be painted 


To display points with large blue labels: 
% show_wcs_points wcs_setup.out blue 20 

Here I have used the tool show_wcs_points to redisplay my test data points. The XY coordinates are plotted in the left panel on the image I am calibrating. The Ra,Dec coordinates are displayed in the right panel overplotted on a DSS image of the same patch of sky.