Solid angle A(μ > 10) in the lens plane computed for z = 6, plotted against the virial mass computed within r₂₀₀ from the weak-lensing measurements of Umetsu et al. (2018). Masses of M1311 and M2129 are based on X-ray scaling relations according to Liu et al. (2020a). The dashed line shows the best-fit linear relation A = 0.08 × (M₂₀₀/10¹⁴ M_⊙)−0.17 as a reference to appreciate the slope of the relation in our sample.