Long-term evolution of the X-ray fluxes and V-band disc fluxes of γ Cas. Top panel: evolution of the X-ray flux of γ Cas, averaged over the yearly APT observing seasons. The blue squares correspond to the ASM data, and the cyan diamonds correspond to the scaled MAXI fluxes (see the main text). The red open circles indicate the yearly averages of the APT V-band flux corrected for the stellar emission and scaled down according to Eq. (5) (see the main text). Bottom panel: yearly averaged X-ray fluxes as a function of near-contemporaneous APT V-band fluxes corrected for the stellar photospheric emission. The symbols have the same meaning as in the top panel.