Dependence of inflection point position (given as fraction of rotation period, P_rot =30 d) on S-index and stellar photometric variability (shown in red in top and bottom panels, respectively) as well as dependence of photometric variability on S-index (middle panel). Blue asterisks in upper panel indicate the dependence of the facular to spot ratio at the time of maximum area, S_fac ∕S_spot, on the S-index. Black vertical lines in upper and middle panels point to the range of solar S-index values, while the horizontal black line in the top panel corresponds to the position of solar inflection point from Amazo-Gomez et al. (2019).