Schematic illustration of the proposed geometry of the WN along the line of sight. Following the interpretation of Sakamoto et al. (2021b), we assumed that the south side of the disc faces us with an inclination of i≈60° and that the biconical outflow is normal to the disc. The direction of the tilt is debated (Scoville et al. 1998; Van der Werf et al., in prep.), but we note that it does not affect the interpretation of the absorption bands in this work.