Paper:	Analytical Flatfield Corrections on VATT Data
Volume:	364, The Future of Photometric, Spectrophotometric, and Polarimetric Standardization
Page:	563
Authors:	Boyle, R.P.; Janusz, R.
Abstract:	We describe our methods to correct the initial flatfields by removing detected systematic dependency of the stellar magnitudes on their location in the CCD frames. Assuming flatfields are made with exposures on a unit input light source and that no added scattered light arrives in the focal plane, then such flatfields should be fine for calibrating the exposures on star fields. But at VATT (and probably most telescopes) the two assumptions of unit input and of absence of scattered light, are not strictly valid. And so the photometry is compromised unless correct flatfields are found.

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