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Schematic diagram of the FIMS FOV and the coordinate system of STSAT-1 and FIMS/SPEAR. |
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The SPEAR team excluded data suffering from the attitude time-delay problem. For multiple complex reasons that remain under investigation (see "sky coverage" in FIMS vs. SPEAR Features), the SPEAR products have a total all-sky exposure time about 20% less than that of their FIMS equivalents. The ratio is not one-sided, and there are regions in which the SPEAR pipeline netted substantially more exposure time than the FIMS pipeline. That said, one of the likely reasons for the SPEAR products' lower total exposure time is that the FIMS pipeline recovered data with time-delayed attitudes that the SPEAR pipeline discarded.