Sizes and central points of blue vs red images are different

[rmcgurk]

Question submitted by Mike Koss and Jarred Gillette to Rosalie on 5/17/24:

We used the small BL for both the red and the blue.

I am looking at the stacked image and the sizes are different and the central points are different
52x134 blue (right image below)
37x138 red (left image below)

And the target is at 18x69 and 26x68.

Do the blue and red channels really have different numbers of spaxels and different central pixels where your target appears?

Do they both have 0.147x0.35'' spaxels?

There's also some very noisy regions in the red channel (see left image below and blue ifu on right). Has anyone seen this before?

[gannonjs]

I've seen this kind of smearing when stacking due to the WCS input of KCWI being a little off. You can kind of see down the bottom of the red that some frames have been stacked higher up than others which is elongating the frame. Perhaps not the only issue but check the weight file of the stack to see if its different in red vs blue