Position-velocity diagrams of the [O I] λ5577 (left), [O I] λ6300 (middle), and [S II] λ6731 (right) FELs in 2003, 2010, and 2021 from DG Tau. Contours start at 3σ (2003) and 7σ (2010, 2021) above the background rms noise and increase by factors of $\sqrt{2}$ (2003) and $\sqrt{3}$ (2010, 2021). The kinematic components identified by Chou et al. (2025) in the 2003 data (HVC1, HVC2, and LVC) are marked. The assumed distance to DG Tau is 125 pc (see Table 1).