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Published online by Cambridge University Press: 08 February 2017
A new calibration has been developed for GEISHA (Groningen Exportable Infrared System for High-Resolution Analysis) employing the zodiacal emission that is clearly present in each long scan. We have assumed, because of several other fundamental IRAS studies, that the zodiacal emission as a whole (ZEM) can be approximated by the emission of a tilted oblate ellipsoid emitting at a certain effective brightness. Besides this zodiacal emission, there is always a contribution of the galactic emission (GEM). As a standard candle, we take the sum of ZEM and GEM. We allow the electronic baseline to change linearly over a scan. We assume that the slow exponential decay that occurs will be sufficiently approximated by a straight line. The nonlinear behavior of the gain is corrected by a model developed in Groningen.