Left panel: photospheric activity proxies, Sph (in ppm), for each of the BLUE, GREEN, and RED channels of the VIRGO/SPM observations as a function of time. Right panel: photospheric activity proxy, Sph from the VIRGO/SPM GREEN (GREEN dots) and RED (red dots) channels as a function of the photospheric index, Sph, from the BLUE channel. The solid lines correspond to weighted linear regressions between the data, and the dashed line represents the 1:1 correlation.
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