Line-of-sight hydrogen column density vs. IR-based Eddington ratio. The black solid line shows the effective Eddington limit (﹩{\lambda }_{\mathrm{Edd}}^{\mathrm{eff}};﹩ Fabian et al. 2008, 2009). The pink shaded area represents the “forbidden” region obtained by the effective Eddington limit and the ﹩{N}_{{\rm{H}}}^{\mathrm{LoS}}﹩ = 10²² cm⁻² limit, below which absorption by outer dust lanes may become important. Symbols and colors are the same as in Figure 3. The black open circles, open squares, and filled points mark the detections of strong molecular outflows with velocities of V_out,mol ≥ 500 km s⁻¹ (e.g., González-Alfonso et al. 2017; Laha et al. 2018, and references therein), ionized outflows (e.g., Rich et al. 2015; Kakkad et al. 2018; Fluetsch et al. 2021), and UFOs (Mizumoto et al. 2019; Smith et al. 2019), respectively.