Fig. 8
The two previously reported maser lines from W51-IRS2 (Mauersberger et al. 1987; Zhang & Ho 1995), which were found to only exhibit quasi-thermal emission. The triple component line shape of the NH3 (3, 3) transition is caused by hyperfine splitting. Channel spacings are 0.88 km s-1 for the (10, 8) and 0.77 km s-1 for the (3, 3) profiles, respectively.
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