flat-fielding in my sleep

While I was on the plane flying home, Rory Holmes (MPIA) implemented some things we had talked about related to internal (self-) calibration of photometric data sets, in a toy context. It looks (as expected) like the quality with which you determine your flat-field is a strong function of how you sampled it. This project is expected to evolve into something about how you should design your survey (WFIRST or LSST or the like) to ensure precise photometric calibration.

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