Right now we use the APS star catalog, as modified by Greg Aldering, to
mask known stars. This is done to suppress missubtractions.  We could
do better, since the NEAT images should allow much better star/galaxy
separation and we could fill in sky coverage gaps that exist in the APS
catalog. The idea then is the use the code which Marc Rafelski
developed to make a better star catalog.  A byproduct would be a galaxy
catalog, whihc would be useful for the percentage increase work (see
list).