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Fig. 1
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Line-ratios of H2CO (30,3 − 20,2)/(10,1 − 00,0) (top) and H2CO (32,1 − 22,0)/(30,3 − 20,2) as a function of volume densities and gas kinetic temperature computed from pyradex. Bottom plot shows the “bump” at n(H2) ≥ 105.5 cm−3, discussed in Sect 6.1.
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