Fig. 11.
Colour-coded difference in fractional plage areas derived from RP1 (top) and MD1 (bottom) images downgraded to simulate effects of seeing and those derived from the original RP1 and MD1 images, respectively. The MD1 data used here are only those taken with a CCD camera between 2002 and 2017. Each row (column) of boxes shows results derived from a given observation (width of the smoothing Gaussian function). See Sect. 4 for details.
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