If you use the Save .IMG File feature, you may find that the files produced
are somewhat large (i.e. all over 32K long.) This is because they are encoded
in BIT STRING format, which is the least efficient (and easiest to write)
method of saving IMG files. A compacting algorithm will be implimented in
later releases of MolSys, but for the present, if you have a lot of IMG
files saved, loading them into an IMG compatible paint program such as
HyperPaint and then re-saving may save you a lot of disk space.

R.M.