Population-level correlations caused by hierarchical mergers. Diagonal panels show the inferred one-dimensional mass, effective spin, and redshift distributions of the main population (violet), 2G+1G subpopulation (green), and combined, or total population (orange). These are marginalized over all other dimensions. Off-diagonal panels show filled contours of the total population in orange, with locations of the main population and subpopulation contributions indicated with unfilled dashed and solid contours, respectively. All two-dimensional contours show hyperposterior-averaged distributions, while the one-dimensional mass and redshift distributions show hyperposterior uncertainty as shaded bands. Correlations can be observed between all parameters shown: the high-mass tail of the population increases with redshift, the effective spin distribution broadens with redshift, and the effective spin distribution modulates with mass.