Convergence bispectrum for sources at redshifts z_s = 0.6,1, and 1.5, for equilateral triangles. The points are the results from numerical simulations with 3-σ error bars. The low black dashed line “tree_L” is the tree-order bispectrum (28), the green dotted line “tree_NL” is the tree-order formula (30), where we use the nonlinear power from the “halo-fit” of Smith et al. (2003), the two yellow dashed lines “F_2,NL” (31) include in addition a fitting formula for the kernel F_2,NL from Scoccimarro & Couchman (2001) and use either P_S(k) (lower curve) or P_tang(k) (upper curve) for the 3D power spectrum, the upper blue dot-dashed line “scal.” is the phenomenological scale transformation (32) from Pan et al. (2007), and the red solid line “comb.” is our combined model (13)–(16). The vertical arrows are at the same scale as in Fig. 1.