More specifically, overlap_slices allows one to extract an smaller array from a bigger array while taking care of the correct behavior at the boundaries. Therefore, I'm able to extract the overlap sources without repeating the overlap parts (or extracting twice as I was doing before).
The following images illustrates an example of the use of overlap_slices.
Although, we have some things yet to decide and implement, I've started to write the documentation for the PSF Photometry. It's still on its infancy, but you can check it out on #385.
Now, to work! :)