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Fig. A.1
Comparison of the CO+ line profile (in red) with the [13Cii], 13CO (10−9), CO (9−8), and H13CO+ lines (in black) at the IF position, where the intensity is scaled to unity. Herschel data are presented in Pilleri et al. (2012) and Ossenkopf et al. (2013). The blue dotted line indicates the systemic velocity (10 km s-1).
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