Second example. Source function (first row) and Stokes I, Q, U, and V as a function of reduced frequency v (second to fifth row, respectively) at five different positions of the discontinuity, τ_c = 0.6, 0.675, 0.75, 0.825, and 0.9 shown in this sequence from the first column to the last column. Each panel shows the curves for the continuous interpolation according to Eq. (32) (light blue), the piecewise constant reconstruction according to Eq. (30) (blue), the piecewise linear reconstruction with minmod slope limiter according to Eqs. (31) and (14) (red), and the reference solution (orange, dashed).