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Comparison between the scaled peak flux of the C2H radial profiles and the millimeter-dust mass outside the CO snow line. The C2H non-detections are indicated in blue, and these data points represent 3σ upper limits. The C2H detections are shown in red with 1σ error bars. Transition disks are encircled. The numbers correspond to the targets as listed in Table A.1. Horizontally, the error bars indicate the range of dust masses for the chosen temperature of the CO freeze-out temperature (22–30 K), where the data point represents the average between these two values. The bottom panel shows the cumulative distribution function of the dust masses for the two groups, computed using the KME (see text). The two-sample tests indicate that although there is some overlap between the two samples, they are statistically distinct and the C2H non-detection is possibly linked to the lower amount of CO-ice-covered millimeter dust in the disk.
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