Simulated values of the photometric brightness change δ(b + y)/2 as they would be measured from the equatorial plane (red curve), at 57° inclination (magenta curve), and from the stellar rotational axis (blue curve) vs. S-index. Unlike Fig. 8, the dependences are calculated over a broad range of stellar magnetic activity. The range bars designate the observed ranges of chromospheric activity variations of the Sun, HD 81809, HD 10476, and HD 82885.