Comparison of V-band OGLE lightcurves of images A & D (points) of QSO 2237 + 0305 with the lightcurves derived from our spectra (diamonds; crosses are used for epochs deviating from the OGLE lightcurves). Error bars (not displayed) are typically of the order of 0.02 mag (A) and 0.04 mag (D).
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