Angular offsets (along the main axis with position angle 225° toward the southwest) of molecular vs. continuum centroid position (obtained from two-dimensional Gaussian fits) as a function of depth of the spectral dip near the systemic velocity in percent of the line peaks at V ≈ 430 km s−1. The percentages given refer to a covered area of 0.25 arcmin2 as described in Fig. 4. Molecular species are indicated. For details, also including line assignments, formal uncertainties and rest frequencies, see Sect. 4.1.2 and Table 1.
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