Dependence of the mean variability in R₃₀ on the inclination (termed ⟨R₃₀⟩_i, where i stands for the inclination). All values have been normalised to the respective equator-on (i = 90°) value, here called ⟨R₃₀⟩₉₀. Individual curves represent different filter systems. Left panel: Kepler, TESS, and CoRoT. Middle panel: three Gaia filters. Right panel: three VIRGO filters and the TSI. The vertical dashed black line indicates an inclination of 57°.