Gray-scale image: VLA A-Array 7 mm continuum observed by Beltrán et al. (2007). The white triangles and yellow squares mark the VLBI positions of the H2 O 22 GHz and CH3OH 6.7 GHz masers, with symbol area proportional to the logarithm of the maser intensity. The colored dots give the channel peak positions of the H30α line emission, with colors denoting VLSR as indicated in the wedge on the right of the plot. The dashed black line marks the axis of the spatial distribution of the H30α peaks. The VLBI maser and VLA continuum absolute positions have been corrected for the apparent motion between the corresponding observing epochs and the ALMA observations, and should be accurate within 10 mas. The H30α position has been offset by 10 mas (less than the expected ALMA position accuracy) both to E and S, to obtain a better alignment with the axis of the radio continuum emission.
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