Distribution of the area of the “dip” in the ¹²CO(2–1) profiles; IRAM data. Contours (lowest(step)highest) are 0.5(0.5)3.5 K km s⁻¹. A Gaussian curve was fitted to each profile (ignoring the “dip” and wings); the fitted profile was subtracted from the original and the result multiplied by −1. The residual was then integrated between 1.3 and 3.4 km s⁻¹. The filled circle indicates the position of the sub-mm peak (see Figs. 2, 3). Offsets are relative to the 2MASS position of the YSO (see Table 1).