Fig. 4
Top: observed spectra of 3C 454.3 in the optical-UV band obtained from different epochs of UVOT observations analysed in this paper. Red diamonds refer to the mean UVOT observed spectrum. The solid line is the log-cubic fit used in the calibration procedure. Bottom-left: optical-UV SEDs of 3C 454.3 corresponding to the observed spectra shown in the top panel. Red diamonds are derived from the UVOT average spectra shown in the top panel by using standard prescriptions to obtain de-reddened flux densities. Black squares represent the mean UVOT SED after recalibration as explained in the text. Bottom-right: the same SEDs shown on the left, after correction for the emission lines contribution.
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