Fig. 2
Light curve of 3C 345 in the optical filters. The black circles are those measured by CSS. Red squares come from Swift/UVOT, blue stars from the Kunming and Lijiang telescopes, the green triangles are measured by the Asiago Schmidt telescope. From left to right: U magnitude, B magnitude, V magnitude, R magnitude, and I magnitude. The vertical dashed line indicates the 2009B flare.
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