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Fig. 2
Neutral atomic carbon column density related to H I and H2. Left: N(C I) vs. N(H I); Right: N(C I) vs. N(H2). Superposed are results for models in which grain-assisted atomic-ion neutralization does not operate, at densities n(H) as indicated and for G0 = 1. Sources of C I measurements are labelled as in Fig. 1.
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