Wolfram Freudling
wfreudli@eso.org
The flux calibration of spectra extracted from NICMOS grism observations has to take into account the effect of undersampling of the Point Spread Function (PSF) on the NIC3 detector. Intra-pixel sensitivity variations have a significant effect on the extracted spectra of compact objects. The latest version of the ST-ECF spectrum extraction software NICMOSlookfully supports correction for this effect. This article describes the nature of the problem, the approach to correct for it and how the features in NICMOSlook should be used.
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