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Fig. 11
χ2 fits to RADEX data and the observed H2CO lines to a constant temperature with variable column density (see Fig. 13) and an H2 density of 106 cm-3 for the northern ridge (dashed) and the southern ridge (solid). The greyed areas in the plot correspond to solutions with τ > 10 (left) and τ < 0 (right).
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