Convergence bispectrum B_κ(ℓ₁,ℓ₂,ℓ₃) for isosceles configurations, where ℓ₁ = ℓ₂. The first two rows show the dependence on the common side ℓ₁ = ℓ₂, at fixed ℓ₃ (in the weakly nonlinear regime in the first row, and in the highly nonlinear regime in the second row), while the third row shows the dependence on the third side ℓ₃ at fixed ℓ₁ = ℓ₂ (around the transition scales). The symbols are the same as in Fig. 2.