Enclosed dynamical mass against the product σ_los²r_proj/G for 22 eROSITA clusters and 10 HIFLUGCS clusters from Li et al. (2023a). Note that velocity dispersion is measured at rather than within a specific radius, i.e., σ_los = σ_los(R = r_proj)≠σ_los(R < r_proj), while the dynamical mass is cumulative, M_dyn = M_dyn(r < r_proj), where R and r are 2D and 3D radii, respectively; r_proj is the projected radius. The correlation can be described by a power law (the solid line): log M_dyn = (1.296 ± 0.001)log(σ_los²r_proj/G)−(3.87 ± 0.23). The total scatter is 0.14 dex (∼32%). To clarify, points with errors are the binned results at different radii, so a cluster could have more than one point.