Combined light curve in the r band from the best solution in the third column of Table A.1. The A curve (red circles) is compared to the magnitude- and time-shifted B curve (blue squares). Open circles and squares are associated with the full brightness records, while filled circles and squares correspond to periods of overlap between both records. In the overlap periods, magnitudes of B are binned around dates of A using α = 20 d (filled squares; see main text).