Fig. 14
Discrete correlation function (DCF) between the 
light curves of all source pairs including NGC 7027 and 3C 48 and 3C 286. The most prominent maxima above the 5σ significance levels appear around zero time lag where the correlation factor is ~ 0.8 ± 0.2 and ~ 0.6 ± 0.2 for the 4.85 GHz (top) and 8.35 GHz (bottom) data, respectively. The dashed lines indicate the 5σ significance level.
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