Fractional variability amplitude, Fvar as a function of frequency for data simultaneous to the MAGIC observation periods (left) shown in Fig. 3 and long-term data samples (right) shown in Fig. 4. The Fvar of the radio core (right) is indicated by an open circle, while the values computed for the components C1 to C5 are represented by filled symbols (C1: circle; C2: upward triangle; C3: star; C4: downward triangle; C5: square).
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