| 11 | 11 | Moving on to Peter's analysis of warp/stack SKY levels, I first confirmed that the ppStack code does not subtract any values from the input warps. The images are scaled by a multiplicative factor, individual pixels are rejected, and the remainder are summed. Because of this, the pixel distributions of the stack and the input warps must agree to within a scaling factor. Looking at histograms of all warps and the stack (which I constructed from the warps listed on Peter's analysis, and adopting the factor of 14 between an individual warp and the stack listed there): |
