No Title Prev. Our major concern was not the present of structures in the flat field ratios but their wavelength dependence. In fact, if the ratios of flat fields turn out to be independent of wavelength, one can easily obtain one from the other with very high accuracy. FLAT's became not feasible in the future. The ratios of these different flat fields vary both with position and wavelength.
Discrepancies are typically larger for the earthFLAT's.
Different symbols are used for the individual chips.