Fig. 6.
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Neutral carbon [CI]609 μm/[CI]370 μm ratio from our CLOUDY models as a function of the ionization parameter. Each color represents varying X-ray to UV ratios. The metallicity is fixed to 1 Z⊙, the AV to 10 mag, and the hydrogen density to 103 cm−3. The gray dashed line (denoted by * in the legend) represents αox = −0.4 but with an AV = 100 mag.
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