Fig. 2
Top panel: UV light curve of Mrk 509 as obtained with Swift/UVOT, XMM-Newton/OM, and HST/COS. The data have been corrected for extinction. Bottom panel: X-ray light curve as obtained by Swift/XRT, XMM-Newton/pn, Chandra/LETGS, and INTEGRAL/ISGRI. These data have also been corrected for Galactic absorption. For the pn data, the squares correspond to the 0.3–1.0 keV band, the stars to the 2–10 keV band. Note that 1012 JyHz equals 10-14 W m-2 (10-11 in c.g.s. units).
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