From left to right, the HCO⁺ (J = 3–2) on-source and 30′′ offset observations for CW Tau, DG Tau, GO Tau, and V806 Tau. These 4 sources show the strongest HCO⁺ emission profiles in our subsample. A dotted line marks the central radial velocity υ_LSR in km s^-1 for a Gaussian fit to the HCO⁺ on-source emission. In all cases, HCO⁺ emission is detected at the off positions. However, with the exception of CW Tau, it is always at a separate velocity or a weaker intensity, which is why we attribute the emission toward CW Tau to the surrounding cloud and not the disk.