Image of the radio emission (green contours; multi-scale CLEAN image, convolved with a 07 beam; contours start at SNR = 2 and increase with an interval of 0.5) overlaid with images of the optical (left panel, 02 October 2010; Caraveo et al.2010) and X-ray (right panel, 28 October 2010; Ferrigno et al.2010a) emission in the flaring region. The radio emission from the flaring region C1 is offset from the knot A (Tavani et al. 2011) identified in the optical and X-ray emission. The overall appearance of the optical and radio emission is similar in the flaring, with a clear “knee-like” structure seen in the optical and trailed by a similar structure in the radio. It should also be noted that the apparent discrepancy in appearance of C1 and C2 in this figure and in the image in Fig. 3 (convolved with a beam) results from the fact that the component C2 is compact ( in size) while the size of C1 can be as large as (see discussion in Sect. 3.2).