Fig. 1
For the first individual exposure, Gaussian centers of the spectro-astrometric signal as a function of the velocity in both the W-E (east for ΔX > 0) and S-N (north for ΔY > 0) directions, in top and middle panels, respectively. Bottom panel shows the differential FWHM, see text. The Hα line profile is overplotted in blue showing a clear P Cygni profile.
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