Zeroth and first moment maps of field 3 (bottom) and field 4 (top). For the calculation of zeroth and first moment maps, please consult the text in Sect. 4. Field 3 was integrated from −12 km s-1 to +25 km s-1 and field 4 from −15 km s-1 to +20 km s-1. In the images only those pixels are displayed that have a signal above 3σ in at least 3 velocity channels. The zeroth and first moment maps are displayed in units of K km s-1 and km s-1, respectively.
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