Paper:	HST NICMOS Residual Bias Removal Techniques
Volume:	238, Astronomical Data Analysis Software and Systems X
Page:	427
Authors:	Bushouse, H.
Abstract:	HST NICMOS detectors suffer from temporal bias drifts, which lead to incomplete bias subtraction during image calibration. The residual bias signal is spatially constant, so that application of flatfield images during calibration gives rise to an imprint of the flatfield structure. In images of sparse fields the flatfield imprint is easily identifiable and removable through the use of iterative techniques to minimize the imprint. Fields with complicated source structure, however, require more sophisticated approaches, utilizing spatial filtering techniques to isolate and separate source and residual bias signals.

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