(Up to the [wiki:IPP_for_PS1 IPP for PS1])

The camera software has been updated to include new row-by-row bias corrections, and modifications to the readout timings.  We have generated new masks for this update.  I believe we were more stringent in our identification of good and bad structures on this pass, but it is not clear if we have been TOO aggressive. 

Below are the masked-fraction images for the new mask with and without the vignetted region shown. 

masked fraction (full focal plane): 0.147

[[Image(mask-full-focalplane.jpg)]]

masked fraction (unvignetted region): 0.097

[[Image(mask-unvignetted.jpg)]]