Time evolution of various photometric observations in different passbands. Top: green dots denote the ASAS-SN V magnitude (which is for some 0^m​​.5 fainter than the usual Johnson V magnitude, blue dots denote the ASAS-SN g filter observations, red dots denote the KWS Cousins’ I_c observations, and yellow dots denote Hvar Johnson R observations. Bottom: stromgren u − b index from ESO observations (blue) and from Sierra Nevada differential photometry (red). The data generally confirm the long-term trends seen in the U​BV photometry (cf. Fig. 2), but with different amplitude and scatter.