Mass–radius prior distributions for the PP (left panel) and CS (right panel) extensions with Bayesian χEFT uncertainties up to 1.5n₀ without pQCD extensions (GP-N³LO, blue regions), with pQCD extensions (GP-N³LO with pQCD extension, solid red and orange lines), and uniformly sampled in the previous N³LO range (N³LO, black dashed lines). The dark (light) blue regions, the solid red (orange), and the inner (outer) black dashed lines encompass the 68% (95%) credible intervals. The regions at radii R ≲ 8 km in the orange/red contours are a result of softer EOSs being included in the prior by the pQCD extensions.