Ratio B(k₁,k₂,k₃)/ [P_S(k₁)P_S(k₂) + 2cyc.] , where P_S(k) is the fit to the power spectrum from Smith et al. (2003). The red solid line is our model, as in Figs. 5 to 8, the black dotted line is the approximation B_3H = B_tree, the green dot-dashed line corresponds to no counterterms in the 1-halo and 2-halo contributions (), and the blue dashed line makes both approximations. 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.