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Changes that have been made to CALSTIS in version 1.5a include:

CALSTIS was improperly subtracting the dark for CCD and MAMA data which was binned. BASIC2D now properly subtracts the integration time scaled _sum_ of the dark for the binned pixels, where it was previously subtracting the average of the dark for the binned pixels.

This version was installed in the PIPELINE on 11 November 1997 and is availble under STSDAS.

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