BLR R–L relation of AGNs measured by the continuum-based method. The blue circles and red diamonds are based on dust radii measured by RM and OI, respectively. The black stars are three AGNs whose BLR kinematics are resolved by GRAVITY (GRAVITY Collaboration 2018, 2020a, 2021b). The gray circles and squares are BLR RM measured AGNs from Du & Wang (2019) and Grier et al. (2017), respectively. The dashed line is the best-fit R–L relation from Bentz et al. (2013). The continuum-based method derives the BLR radii following a similar trend of the R–L relation based on RM and GRAVITY BLR measurements.