Light curves in the optical, infrared, and radio (3 GHz) for selected objects. In case of optical and infrared curves the individual points represent monthly averaged values after 3σ clipping to reject outliers. For radio observations (NVSS, FIRST, VLA), the points correspond to single measurements. The VLA data come from the VLASS survey as well as dedicated observations, as reported in Kunert-Bajraszewska et al. (2025).