Fig. 1
Ortho-H2 abundance variation with time for 3 different values of ζ, the cosmic ray ionization rate. Crosses and arrows indicate the time it takes to reach an OPR of 1 (full arrows), 0.1 (dashed arrows), and 0.01 (dotted arrows) for a starting value of 3. The calculations are done for a temperature of 10 K and a density of n(H + 2H2) = 2 × 104 cm-3.
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