Estimates of $χoobs(h∣At,S(T))$ (top row) and $χoobs(h;T,t)$ (bottom row) against h (in km) for $T=28,29$⁠, and $30∘$C for 1942 (solid line) and for 2020 (dashed line) for model $M2$⁠. Confidence intervals are based on 10,000 simulations for each 500 bootstrap sample datasets.