EV1 expressed with ṁ as the proxy for R_Fe. Points show FWHM_Hβ versus ṁ from FRADO-driven BLR models at different inclinations, color coded by (left) log M_• and (right) D_Hβ. The upper and lower horizontal axes correspond to FRADO and observational data (gray-shaded area), respectively, with no scaling relation applied between them. Green and yellow circles (⊕) mark the R_Fe-based locations of I Zw 1 (Marziani et al. 2021) and NGC 5548 (Du & Wang 2019). The horizontal green dashed line marks the PA-PB boundary, and the region below the red dashed line indicates the location of NLS1 objects.