It is not quite clear whether we have good enough data for this in hand, but assuming we do, the task is to perform extractions for times when we've followed a star across a range of airmasses, and check how the extracted parameters vary, i.e. whether it's in a physically plausible way.

Will this work? Unclear. Ideally you'd want to have taken the data on a "photometric night" (were such a thing to exist) so that you know parameters are stable, and therefore just a function of airmass, but it is not known whether any of the nights when we made such observations got good enough data, let alone were photometric.