Rachel and a student at Princeton are working on a lensing project using the MaxBCG clusters. We did some comparisons and saw considerable disagreement between the recovered signals. It turns out that during the last iteration of the photozs a bug was introduced that made the colors look really wrong and the photozs too high. This was not in their estimator, but a difference in magnitude systems between training set and my catalog. It was just a confusion of conventions, but of course those can have disturbing consequences
By the way, does anyone read this blog besides my mom?