Fig. 13.
Zeroth moment maps for a region in the outer parts of the GRS. Panels a–d: Results obtained by summing up all spectral channels, applying a moment masking technique (see Sect. 5.1 for details), and clipping all spectral channels with values below 3 × σrms and 5 × σrms, respectively. The contour indicates a WCO level of 5 K km s−1.
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