AB comparisons in the r band. We used the original epochs and fluxes of B (open squares), while the fluxes of A are shifted by +420 d and properly amplified (filled squares). Together with these LRT data, we also show the more poorly sampled USNO fluxes of A (filled triangles) and B (open triangles). Top and bottom left panels: comparisons in two periods of normal activity. The A signal is amplified by 1.019 (see main text). Top and bottom right panels: comparisons in two episodes of violent activity. The A signal is amplified by 1.057 (see main text).