Fig. 5
Optical long-term light curve (R-band) of the core region of PKS 2155-304. The light curve combines ROTSE observations as well as other archival data (solid black circles: ROTSE, open purple circles: All-Sky-Automated-System, red open squares: Osterman et al. 2007; green solid squares: Zhang & Xie 1996; blue solid circles: Griffiths et al. 1979; black open squares: Tommasi et al. 2001).
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