Fig. 7
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Change in the zeropoint of the three tunable elements in the HMI instrument, as determined from the regular detunes. The vertical line indicates the time when the instrument power was accidentally removed. Adapted from Fig. 8 of Hoeksema et al. (2018), but extended in time and with units converted. Some outliers were removed. See Hoeksema et al. (2018) for details.
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