Fig. 12
Knot distances to the radio core of BL Lac over 7 yr, adapted from Lister et al. (2013). Knots 5 and 6 are identified as transients; knot 10 seems ejected from the closest stationary zone from the core. The dashed red arrow represents the displacement of a probable perturbation along the jet having modified the kinematics of knots.
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