Posterior for cosτ (top panel) and differential merger rate per unit cosτ (bottom panel) obtained using the Isotropic + Gaussian model when the mean of the Gaussian component is allowed to vary in the range μ ∈ [ − 1, 1]. The two thin black dotted lines in the top panel show the 90% CI obtained by drawing the model’s hyperparameters from their priors. In both panels, the thin black lines represent individual posterior draws, whereas the colored band shows the 90% CI. The thick dashed line within the band is the median.