Cumulative function of APOGEE sources as a function of their corresponding local 12CO (2−1) emission at their corresponding velocity (see text for description). Four subsamples are considered in this plot: APOGEE-YSO (orange), APOGEE-XMM (blue), APOGEE-Field (green), and APOGEE-YSOs (Protostars; red). The two emission thresholds considered in the text, W0.6 = 0.6 K km s-1 and W4 = 4.0 K km s-1, are denoted by vertical dashed lines.
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