Upper left: 2D histogram of normalized intensities computed for each Carrington rotation after the rescaling. The upper part of plot corresponds to intensities of 0.9, the lower part is at the normalized intensity of 1.5. Upper right: distribution of normalized intensities for CR1690 (black line, maximum of cycle 21) and CR1753 (blue, minimum between cycles 21 and 22). The red line shows a Gaussian fit to the core of the distributions. For reference, the lower panel shows the monthly international sunspot number. The horizontal axis for the upper left panel is the same as in the lower panel. The two dotted lines mark the approximate location of the core of the distribution used for the Gaussian fit. The vertical axis in upper right corner of the plot is the same as in Fig. 2. The color bar in the lower right corner shows the scaling used for the 2D histogram in the upper left corner.
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