Tom, I have checked the 3 nights in wilma:/b2/V3test/. Only 990723s has high density scans. And I checked 3 high density scans (026, 028, 084) in that night. In scans 026 and 028 the masks are too small in general in all the 3 bands. In scan 084, where density is about 2/3 of the density in 026 and 028, the masks look OK. The masks are usually good in low density scans. However, some bright stars were missed by the pipeline and not masked at all. One brt star was mistaken by galwarks as a galaxy. Cong Checked: nights scan density bands wilma:/b2/V3test/990723s 026 h j,h,k wilma:/b2/V3test/990723s 028 h j,h,k wilma:/b2/V3test/990723s 084 h j,h,k wilma:/b2/V3test/990723s 109 l j,k wilma:/b2/V3test/980403n 095 l j,k wilma:/b2/V3test/980403n 057 l j,h,k wilma:/b2/V3test/980403n 046 l j,h,k wilma:/b2/V3test/980403n 057 l j Notes: night scan frame band dnst note wilma:/b2/V3test/990723s 026 245 j,h,k h mask too small wilma:/b2/V3test/990723s 028 021 j,h,k h mask too small (J=4.7) wilma:/b2/V3test/990723s 028 027 j h missed one saturated star (~6 mag) wilma:/b2/V3test/980403n 057 044 j,h,k l a brt star is mistaken as a galaxy (it is located on the spike of another nearby brighter star) wilma:/b2/V3test/990923s 046 139 j l a very brt star (~ 3mag) is missed (not masked). No obvious reason. wilma:/b2/V3test/990923s 046 139 h,k l the star missed in J is masked in H and K. But both masks are too small.