NH3(1,1), (2,2) and (3,3) inversion line spectra observed with the GBT towards the centre of H-MM1. The spectra are on the TMB scale. Fits to the (1,1) and (2,2) hyperfine structures are indicated with orange curves. The origin of the absorption feature seen in the (3,3) spectrum (at 23 869.6 MHz) is unkown to us.
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