Events of GWTC-4 plotted in the m_1, d − d_L plane, colored according to the Spearman coefficient between H₀ and their single-event marginalized likelihood with two different mass models. The ticks represent the MD features of the different models (minimum and maximum mass, as well as the position of the main peaks), plotted at different d_L and H₀ values, as indicated by the green color scale. The luminosity distance values correspond to redshifts 0.09,  0.2, and 0.66 in a flat ΛCDM cosmology with H₀ = 70 km s⁻¹ Mpc and Ω_m, 0 = 0.3.