Fig. 9.

Sampling of measured gain fluctuations at all Planck frequencies. The top row shows 30, 44, and 70 GHz, from left to right, for representative detectors, with “M” and “S” referring to “main” and “side” (see Planck Collaboration III 2020). The second and third rows show HFI frequencies, indicated in the detector names. The vertical lines indicate complete observing years. Seasonal effects due to Solar distance are apparent in the 30 and 44 GHz gains, as well as discontinuities from switching to the redundant 20 K sorption-cooler system on day 455 and changing the transponder setting on day 270.
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