Relationship between source-level log ﹩R{{\prime} }_{{\rm{H}}\alpha }﹩ and multiepoch Hα equivalent-width variability. Other MS eruptive stars and RS CVn systems are shown separately. The left panels show the absolute scatter σ(∣EW_Hα∣), and the right panels show the relative scatter σ(∣EW_Hα∣)/〈∣EW_Hα∣〉. The vertical-axis quantities are calculated from the magnitude of the directly measured multiepoch equivalent widths, whereas the horizontal coordinate is the source-level-normalized excess-emission index. Red connected points show binned medians, and the Spearman coefficients and p-values are listed in each panel.