Fig. 6
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Column densities of CO, HCN, CN, C2H, NO, and HCO+ in the fiducial model with a C/O ratio of 0.4 and a gas gap depth of one (no gap; dark red), 10−1 (fiducial model; orange), 10−2 (pink), 10−3 (purple), 10−4 (blue), and 10−5 (very deep gap; light blue). The small dust density is dropped by the same factor in the gap as in the gas.
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