Fig. 1.

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22 GHz images have the sensitivity to reveal the jet direction in the gap (in 1.7 GHz and 327 MHz VLBA images) between z ≈ 400 mas and HST-1. The red lines in the gap are the range of the standard error in the linear fit to the peak intensity (identified with the jet center-line). HST-1 lies on a short extrapolation of the jet center-line to within ±6 mas. The image from December 31, 2004 is at the beginning of the flare. The Gaussian beam FWHM in blue provides a scale for the image.
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