Samples of diffuse [C ii]-w/o-CO and H i without [C ii] or CO for RG<R⊙. The gas pressures P1, P2, and P3 in all panels a)–c) correspond to 3000, 6000, and 104 K cm-3, respectively. a) Scatter plot of [C ii] intensities verses H i intensities for each spaxel. The dashed lines represent the [C ii] intensities expected for H excitation of C+, corresponding to the H i intensity in each spaxel. The solid lines represent the 3σ detection limit for [C ii] in the 3 km s-1 wide spaxels. b) Plot of the fraction of diffuse [C ii] spaxels ([C ii] without CO) in each H i intensity bin with [C ii] intensities in excess of that expected for excitation in the H i clouds (see text). c) Number distribution of H i spaxels without [C ii] or CO plotted against H i intensity for the sample of diffuse H i spaxels without [C ii] or CO. The dashed vertical lines indicate the minimum threshold H i intensity for detecting [C ii] for pressure models P1, P2, and P3.
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