Size-luminosity relation of the torus of type 1 AGNs. Gray squares denote the inner radius of the torus derived from fitting the MIR SFs with the toy model of the torus. Red circles represent the effective size of the torus estimated from the best-fit transfer function, with the solid red line giving their ordinary distance regression fit to the size-luminosity relation. The uncertainties of R_in are the same as those of R_eff. The dashed gray line shows the size-luminosity relation of low-redshift (z < 0.5) PG quasars estimated using the RM method (Lyu et al. 2019). The shaded gray area represents the 1σ scatter (∼0.17 dex) estimated from a sample of relatively high-redshift (0.3 < z < 2) AGNs (Yang et al. 2020). The dotted blue line is the relation of intermediate-redshift (0.5 ≤ z ≤ 1.2) quasars in Stripe 82, based on a direct comparison between the optical SFs and MIR (W1) SFs, similar to this study. The dash-dotted cyan line denotes the relation of the local Seyferts in the K band inferred from the RM method. Blue stars represent the size of the torus estimated from the K-band interferometry measurements (GRAVITY Collaboration 2020).