Comparison of the BLR radii for IRAS 09149−6206 and 3C 273 measured with GRAVITY to those based on the RM time lag. The black circles are the RM measurements collected from the literature by Du & Wang (2019), which mainly include data from Bentz et al. (2013) and the SEAMBH campaign (see text for details). The blue squares are based on Hβ time lags from the SDSS-RM project Grier et al. (2017b). The dashed line is the best-fit radius–luminosity relation from Bentz et al. (2013).