Main panels: histograms of the time-averaged intensity, as a function of the maximum cross-correlation, in the whole HRI_EUV field of view. The left and right columns show the results for the 193 – 171 and the 94 – 171 couples, respectively. The 2D orange histograms are the counts of event pixels. The 2D red and blue contours correspond to the 20, 40, 60, and 80 percentiles of the events and the QS pixel distributions, respectively. The histograms in the margins were normalized by their total number of counts. No histogram is displayed in the right margin of (a), as it would be a repetition of that of (b). Similarly, the top-margin histograms of (c) and (d) have been omitted, as they are the same as those of (a) and (b), respectively.