Ratio B(k₁,k₂,k₃)/ [P_S(k₁)P_S(k₂) + 2cyc.] , as in Fig. 9. We show the results obtained by using for the 3-halo term each of the three 1-loop perturbative expansions given in Figs. 2−4. In each case, we show both the 3-halo contribution alone (which decays at high k, upper line in front of the labels) and the full result (i.e., the sum of the 3-halo, 2-halo, and 1-halo terms, lower line in front of the labels). We also plot the tree-level perturbative result (black solid line). Upper row: equilateral configurations, at redshifts z = 0.35,1, and 3, as in Fig. 5. Lower row: various isosceles configurations at redshift z = 0.35, as in left panels of Figs. 6 and 7.