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Fig. 8
RADEX non-LTE modeling of 303–202/321–220 ratio of H2CO. The ratio is calculated as a function of the gas kinetic temperature (Tkin) and column density of H2CO for the volume densities n(H2) of 105 (left) and 106 cm−3 (right). Contours with labels mark the observed line-intensity ratios for H2CO.
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