Lensing cross sections σ_7.5 in the range of 0−400   arcsec² computed with the modified semi-analytic method as a function of the lensing cross sections σ_7.5 calculated with ray-tracing method B. The red dashed line indicates the bisector of the σ_7.5–σ_7.5 plane. The lensing cross sections were computed for a sample of 300 massive triaxial dark matter haloes (cf. Sect. 3.5).