These proposals provide a regular monitor of the instrument's QE stability from the FUV to the near-IR, allow tracking of the UV throughput decline due to contaminant buildup, and provide observational PSFs. The standard star observations provide a baseline for the standard field photometry and allow updates to SYNPHOT. The standard field measurements will allow calibration of the filter sets' color terms, as well as enabling a mapping of the geometric distortions across the field of view. The four CCD photometry program provides the relative CCD-to-CCD sensitivities for the filter set and allows the regular PC1/WF3 standard star photometry to be applied to WF2 and WF4.
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