Prediction of the abundances relative to H2 of C+, C, CO, CH, CCH and c-C3H2 from the PDR Meudon models with various hydrogen densities and pressures. Models with AV = 5 mag are plotted with open squares, AV = 3 mag with black squares and AV = 1 mag with crosses. Constant pressure models are plotted using the highest density point as abscissa. Models with elevated cosmic ray ionization fluxes are drawn in red, using larger symbols. The gray bars indicate the observed abundances of CH (Sheffer et al. 2008), CCH (Gerin et al. 2010) and c-C3H2(this work, using the scaling with CCH).
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