Fig. 2
Intrinsic optical-UV continuum lightcurves of Mrk 509 over 100 days at the end of 2009 at the wavelengths indicated above each panel. Blue squares: OM; red circles: measured UVOT; green triangles: UVOT observations for which fluxes have been calculated using a time-averaged SED as described in Sect. 2.1. The error bars of all lightcurves represent statistical and systematic calibration uncertainties at 1σ level.
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