Fig. 13
p-H2CO column densities for the least-χ2 fits to RADEX data and the observed H2CO lines to a constant temperature in each ridge (60 K in northern ridge and 76 K in southern ridge) and an H2 density of 106 cm-3. The colour bar shows values in log 10N, where N is given in cm-2. Refer to Fig. 1 for a guide to the symbols used for the compact objects.
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