Variation of the absolute Q/I including the continuum polarization with magnetic field. The parameters used for the simulation are: ρ_C = 0.05, ρ_J = 1.5 and μ = 0.11. Left panel: the amplitudes of R₁ (solid) and R₃ (dash-dotted) decrease very fast and are nearly fully depolarized above 100 G. The critical field strengths of R₂ (dashed) and P (dotted) are higher. Right panel: magnification of the region from 0 G to 100 G. The y-axis is scaled with the zero magnetic field Q/I value, i.e. shows the amplitude decrease in percent. Because the continuum polarization is included and not only the line polarization is shown, the ratio does not necessarily decrease to 20% for high B.