Fig. E.1

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(a): (Top) CH+ continuum subtracted spectra in DF3 (see Fig. 1); (bottom) LTE model of CH+ at T = 1500 K and Nvib(CH+) = 7.6 × 109 cm−2. The column density of the fit is lower due to extinction in the line of sight. (b): (Top) CH+ continuum subtracted spectra in d203-506 (see Fig. 1). (Bottom) LTE model of CH+ at T = 850 K and Nvib(CH+) = 3 × 1011 cm−2.
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