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This mode was designed for objects with known periodicity in the 50 msec to 100 sec range. To maintain the phase information of these observations, the known period (CYCLE-TIME) of the object was divided into bins or slices, where each bin had a duration time = period / bins. The spectra acquired in this mode were stored in the different bins which corresponded to a given phase of the period. The spectral information obtained in each period cycle was added to the appropriate phase bin (so long as the period was known accurately). Onboard memory limitations placed substantial restrictions on the number of diodes that could be read out and the number of phase bins that could be sampled.
Chapter 32 discusses how Y-base positional uncertainties and GIM effects, coupled with the large pre-COSTAR PSF and the influence of the additional reflections in COSTAR, limited the accuracies of FOS polarimetric observations.
ACQ mode images, discussed above, simply used a pre-defined, optimized set of IMAGE mode parameters. Most dispersed light IMAGE mode observations were made for specialized calibration purposes, but this mode was occasionally used for interactive target acquisitions of moving targets (the so-called dispersed light interactive target acquisition technique).