Logarithm of the BLR radius as a function of log λL_λ(5100 Å) (R-L relation). The blue line shows the best-fit line derived from all 7 GRAVITY-observed AGNs, and the blue shaded region is its 1σ confidence interval. The AGN luminosity is taken from Table 1. The dashed line represents the best-fit radius luminosity relation from Bentz et al. (2013). The 3 published AGNs (IRAS 09149-6206 from GRAVITY Collaboration 2020a, 3C 273 from GRAVITY Collaboration 2018, and NGC 3783 from GRAVITY Collaboration 2021a) are shown as a red star, red diamond, and red square, respectively. Our 4 targets are shown in differently coloured filled squares with 1σ errors. Our best-fit R-L (power-law) relation has a slope of , which is lower but, given the current large uncertainty, still consistent within uncertainties with the slope of R-L relation fit from Bentz et al. (2013; ). If we follow the prescription from photoionisation models, the BLR sizes of 3C 273 and PDS 456 will be adjusted (shown as open symbols), and the fitted GRAVITY R-L relation is shown as the green line.