Fig. 3
N2 column densities (top), photodissociation rates (middle) and their ratios (bottom) when calculated using the plane-parallel (dashed lines: χ = 1.0; spheres: χ = 0.5) and spherically-symmetric (black solid lines) models as a function of radius. The dotted horizontal line indicates kpd(PP) = kpd(SS). Outside the solid vertical line N2 photodissociation becomes considerable.
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