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Fig. 2


Upper panel: total flux density of S4 0917+624 at ~5 GHz in the IDV observations; middle panel: the rms flux density at ~5 GHz; lower panel: IDV modulation index at ~5 GHz versus time, the error on m is the mean modulation index of calibrators. Urumqi data from August 2005 to January 2010 are shown to the right of the vertical line.

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