Hα excess (dash-dotted black line), mean intensity (dashed red line), and number of pixels in mask (solid blue line) for 15 active regions during their disk passage. The vertical dashed lines indicate the crossing of the active region through the central meridian. For each active region, we calculated the Spearman correlation of the Hα excess with the number of pixels ρ_E, P and with the intensity ρ_E, I, as well as the Spearman correlation of the number of pixels and the intensity ρ_P, I. The asterisks next to the active region number indicate the flaring activity (see Table 2).