Column density of CF+ vs. H13CO+ (at left) and C2H (right). Data for the Horsehead nebula (TdC) are from Guzmán et al. (2012a). The prediction N(CF+) ≈ 4.5 × 1011 cm-2 at AV≳ 1 mag of Neufeld & Wolfire (2009) is shown as a blue dashed horizontal line. The power law slopes of the best-fit lines (0.59, 0.38) are noted.
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