Mykytyn continued to work on our measurements of huge galaxies, after a lot of fiddling around with various kinds of galaxy radii. He also figured out that we can measure M51a no problem, and M51b will probably work too, so we can do some pretty big galaxies with The Tractor.
While he was shepherding fits, I was building a data-driven model of the psf from the Fizeau Interferometer called LMIRcam on LBT (thanks to Andy Skemer of Arizona). Here's an example (below). The left is the data, and the right is my model. It looks just like a textbook example of an optical interferometry PSF (which up to now have only appeared in texbooks, never in the readout data from real instruments)!
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