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Fig. 3


Fractional variability (Fvar) as a function of the frequency for the 2.3 yr long time range from February 2007 to July 2009. The fractional variability was computed in two different ways: using all the flux measurements from the light curves reported in Fig. 2 (depicted with open markers), and using only those observations simultaneous to the VHE γ-ray measurements from MAGIC (depicted with filled markers). Vertical bars denote 1σ uncertainties and horizontal bars indicate the width of each energy bin.

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