| | 5 | The following table shows the comparison between the current MD09 deep stacks (deeptest or reference below) and the reduction with the current ppStack changes (MDtest or comparison below). I used four skycells that Mark noted were particular bad. The images show that the new code does a better job retaining images and that cleans up some of the i-filter skycell issues. However, this improvement does not extend to y/027, which still has a clear region of high variance. The profiles in the next column show a slice across the image from 2000-2500pixels in X (red) and Y (blue). The median variance for that profile from the weight image is also displayed (in green and purple). This illustrates that the new reduction does remove some of the un-modeled image variance jumps that were present in i/041 and i/061. The final column shows the profile of a star in the stack for both the reference (red) and comparison (green) stacks, along with the Gaussian fit sigma value for each. These profiles suggest that even though the comparison target PSF is larger than in the reference deep stacks, the stellar profiles in the unconvolved stack do not change significantly. |
