Scatter and correlation of amplitudes in Fe I (top) and Sr I (bottom) with circular polarization amplitudes of Fe I (circles) and Sr I (plus), respectively, scaled to their maximum values. The notation is used here. The Pearson’s correlation coefficient r is determined together with the p-value by the linear regression fitted to the scattered data and displayed in the panels (n: total number of scattered points). The shaded area is the 95% confidence interval for the fitted parameters.