13.23 OPTICAL
\zxhlp{COSTAR} Verb to plot a symbol at given position on top of a TV image
\zxhlp{GSTAR} Task to read a Guide Star (UK) table and create an ST table.
\zxhlp{IMFLT} fits and removes a background intensity plane from an image
\zxhlp{STFND} Task to find stars in an image and generate an ST table.
\zxhlp{STRAN} Task compares ST tables, find image coordinates (e.g. guide star )
\zxhlp{TVSTAR} Verb to plot star positions on top of a TV image
\zxhlp{XTRAN} Create an image with transformed coordinates