Column density of c-C3H vs. H13CO+ (at left), and C3H2 and C2H (right). Data for the hydrocarbons toward the Horsehead nebula (TdC) are from Pety et al. (2012). Data for TMC-1 are from Ohishi et al. (1992). The c-C3H survey data of Mangum & Wootten (1990) are shown at right, labelled “MW1990”. The solid line at left has power-law slope 1; at right, both lines have slope 0.8.
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