Recombination line (RRL) emission images of the inner ≲3 pc. From left to right: H39α and H51β in the central 80′′, both with the 100 GHz continuum contours as in Fig. 2, and H36β overlayed with the 250 GHz contours as in Fig. 2. H49β and H33β can be seen in Fig. A.2. The beam sizes are 1.9′′× 1.6′′, 1.8′′× 1.4′′, and 0.7′′× 0.6′′, respectively.
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