Core locations at 15, 43, and 86 GHz (black) and extrapolated jet apex location (dark red), plotted over the 86 GHz total intensity map. The contours start at 0.1% of the image peak (1.82 Jy beam−1) and then increase in steps of two. The solid light red line is obtained from a 2D line fit to the core positions at different frequencies and the jet apex location with respect to the reference point (i.e. 86 GHz core). The broken light red lines show the 99% confidence interval of the fit.
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