Let's refresh our memory regarding the "quality of fit" for gain map simulations as a function of the number of grid points and the spacing between points. For a variety of resolutions ranging from 0 to 50 microns, and averaging each gain map over 50 data points, plot:
Note that we are ignoring actual gain errors at this point. Consider the ideal scenario where gains == 1 and offsets == 0. Every resolution uses the same scales for the three plots.
