Model predictions for the [O I]145/[O I]63 luminosity ratio as a function of visual extinction in the cloud. The default model (solid curve) has parameters: nH = 103 cm−3, G0 = 103, Zbin = 0.5. Increasing the cosmic ray rate by a factor of 10 (dashed curve) or adding a soft X-ray component to the input radiation field (dotted curve) both increase the PDR heating and predicted [O I] line ratios. The gray shading indicates the observed range of ratios.
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