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Fig. 6

Fig. 6 Refer to the following caption and surrounding text.

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Comparison between the flux density ratios between the NW and SE lobes at mid-IR (black circles) and near-IR (magenta squares) as a function of time. The solid black and dashed magenta curves represent the best fits to the points of the same colour. The data and the fits are the same as in Figs. 4b and 5b.

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