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How can I examine both HIFI on and off-source spectra?
Posted by Mark Kidger on 11 September 2018 03:34 PM


HIFI spectra can be of two kinds: ON source spectra, in which the keyword "isLine=True) and OFF source, reference position spectra, for which isLine=FALSE. The reference position though may, itself, be contaminated by background emission, compromising the reduced on-source spectrum. The best way to eliminate or, at least, to assess this effect is to examine the OFF source spectra. The Herschel Science Centre has produced a short videotutorial that explains how to examine the OFF spectra. You can find this videotutorial here:

https://www.youtube.com/watch?v=Tpte_3LTL-s

OFF spectra can be different things for different observing modes. The short videotutorial will show you what the OFF spectrum represents for each mode and will take you through a practical example of how to examine and plot the OFF spectrum in the observation context. It will also show you the effects of line contamination in an OFF spectrum when it is used for background subtraction.
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