Epoch 16, 2009 October 22. a) Core spectrum, where Qa represents the core and Qb the feature moving downstream. For comparisons, see Figure 4b. Core-shift vectors of all frequency pairs using b) Qa and c) Qb. In this case, the two components have a similar impact on the direction of KQ core-shift vector. Power-law fits (red curve) using d) Qa and e) Qb. In this epoch, the flare appears to hinder the correct location of the core at the Q-band (43 GHz).