LT r-band light curves of QSO B1413+117. Left panel: RATCam photometric data at 3 epochs in May–June 2006 and 33 selected epochs in 2008. Right panel: IO:O data at 30 selected epochs over the period 2013−2016. For comparison purposes, we also include the brightness record of the field star S40. This object has a magnitude similar to those of the quasar images.
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