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

Below are the masked-fraction images for the new mask with and without the vignetted region shown (for the new mask -20101215). 

masked fraction (full focal plane): 0.145

[[Image(mask-full-focalplane.jpg, 548px)]]

masked fraction (unvignetted region): 0.087

[[Image(mask-unvignetted.jpg, 548px)]]