Spectra (gray bars) and chi-square fits (black solid line) of NH3(1, 1) and (2, 2) from the centre of the northern core (from the 10″ resolution map). The (2, 2) spectrum is offset by −1 K for clarity. The splitting of the (1, 1) components is due to hyperfine structure, and is not to be taken as a sign of self-absorption.
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