Fig. 3
H2 fractional abundance in the gas phase (gray) and on the dust grain surface (black) relative to 
as a function of total H2 density for the three models 440-noED (solid line), 23-noED (dotted line), and 440-ED (dashed line). The dotted and dashed gray lines, which blend into one another, are horizontal and lie atop the figure.
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