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A method for background illumination correction for the Hamilton Echelle Spectrograph is presented. The background is parameterized as (1) a global two dimensional polynomial of scattered light, and (2) a local contamination of spectral features from adjacent orders modeled as a power law in the cross dispersion. The latter component corrects the overlap of closely packed adjacent orders. The significance of the local component is verified by statistical tests and interorder inspection. A software tool useful with the Image Reduction Analysis Facility has been made publicly available.
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Churchill et al. (1995) studied this question.
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