Cumulative distribution functions (cdfs) of the effective inspiral spin parameter χ_eff as predicted for O1/O2 by our model (solid orange line). Left: from our model we generate 5000 sets of 10 measurements and plot the median cdf (dashed orange line) together with the 90% credible interval (shaded orange region). Right: we generate again 5000 sets of 10 measurements from our model to which we now add mock measurement uncertainties generated from the zero-centered LVC data likelihoods. We plot the median cdf (dashed orange line) and the 90% credible interval (shaded orange region). For both graphs, in gray, we plot the median cdf (dashed line) and the 90% credible interval (shaded region) of 5000 samples from the 10 actual observations generated from their respective LVC data likelihoods.