Fig. A.1
Rotational NH3 temperatures determined for the core around the HC HII region W51e2-W. The temperatures are fit to the slope of the normalized NH3 column density Nl (in units of cm-3) plotted against the energy of each transition El (in units of Kelvins), using Eq. (A.6). Only transitions with measured optical depths were used in the fits: (6, 6), (7, 7), and (9, 9).
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