Fig. 1
Examples of differential light curves from our sample. mBL, mc, mk are the instrumental magnitudes for the blazar, the comparison star and the control star, respectively. From top to bottom, left to right: PKS 1253−055, PKS 1749+096, PKS 2230+114, and PKS 2251+158. Data for the V filter are shown in green, data for the R filter in red. Upper panels: object − comparison star differential light curves; lower panels: control star − comparison star differential light curves. Note that both panels are shown with the same scale for a given blazar.
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