Channel maps of the H77α radio recombination line integrated over 5 km s-1 windows for W51 Main and IRS1. There are small ring features notable at low and high velocities; these are identified in Fig. A.2. These images demonstrate that there are two distinct but possibly interacting bubbles along the line of sight in W51 Main. The synthesized beam size is θFWHM ≈ 0.42″.
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