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Fig. B.1


Top: observed o-CH2 70 GHz spectrum towards W3 IRS5 (black) alongside the HFS decomposed fits (dotted blue) and the combined fit (red). Middle: HFS stacked profile (red) with the fit to each HFS component shifted to the systemic velocity of the source (dotted blue) and the Gaussian noise profile (black). Bottom: resultant stacked spectrum with the addition of noise (black).

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