Lensing cross sections σ_7.5 in the range of 0−400   arcsec² according to method A (blue crosses), the semi-analytic method (turquoise crosses) and method A fitting ellipses only (yellow triangles) as a function of the lensing cross sections σ_7.5 computed with method B for a sample of 300 massive dark matter haloes (see text). The red dashed line indicates the bisector of the σ_7.5–σ_7.5 plane. The violet dashed line represents the best linear fit of the semi-analytic lensing cross sections.