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The Herschel PACS photometer calibration. A time dependent flux calibration for the PACS chopped point-source photometry AOT mode

Sauvage, Marc; Okumura, Koryo; Linz, Hendrik +7 more

We present a flux calibration scheme for the PACS chopped point-source photometry observing mode based on the photometry of five stellar standard sources. This mode was used for science observations only early in the mission. Later, it was only used for pointing and flux calibration measurements. Its calibration turns this type of observation into…