Fig. 12
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Line ratio between the N2H+ (4−3) and N2H+ (3−2) transitions (color scale). The blue contours show the emission of H2D+ while the black contours indicate the extent of the N2H+ (3−2) emission. The additional square marker east of 16293E marks the 450 μm dust continuum peak. Low line ratio values close to the H2D+ peak agree with the interpretation of having the coldest (and densest) part toward this spot.
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