Inflow in ESO 320-G030 observed in the far-IR [O I] 63 μm line and OH doublets. The gray vertical lines indicate the position of the two components of the OH doublets (blended within a single feature in the case of OH 71 μm in panel g), and the vertical arrows in panel c indicate the position of the ¹⁸OH 79 μm doublet components. OH is modeled with the same components as derived from H₂O: the core (dashed blue lines), the nuclear disk (dashed green) and the envelope (dashed gray); red is total. The inflow is simulated in the envelope component (see Sect. 4.2). The model also includes the contribution by ¹⁸OH, NH₃, and H₂O in panels c, e, and f–g, respectively (see Appendix A).