Toward a robust physical and chemical characterization of heterogeneous lines of sight: The case of the Horsehead nebula

Open Access

Fig. 9

Joint histogram of N(HCO⁺)/N(¹²CO) versus N(H¹³CO⁺)/N(¹³CO) in log space for the 3224 chemical models sampling various physical conditions in translucent gas. The red circle shows the ratio derived from the basic abundances listed in Eq. (24). The dashed blue line has a slope of 1.0.

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