Keywords: clic

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### Correction

As explained in section 3.3.2, there are usually two spectra per observation: one which is the simple average of all the dumps within the observations, one for which each individual spectra is corrected by a phase , where is the correction for atmospheric phase derived from the Water Vapor Radiometer (WVR) for antenna , prior to the averaging. For older data (before 2006), the 1mm total power data have also been used to monitor atmospheric phases (see `HELP MONITOR`).

`STORE CORRECTION` can be used to store in the observation header whether the atmospheric phase correction is valid or not. Besides the `GOOD` or `BAD` keywords, keyword `AUTO` is the one that is recommended to be used. It will compare the amplitude of the phase corrected or uncorrected data (with a bias toward uncorrected data) on calibrators, and then automatically decide which should be used for the science scans according to the closest in time phase calibrator correction validity.