Variations in polarization of λ Tau on the (q, u) plane. The solid lines show the second harmonic fits in the BV R bands. Phases of the orbital period 0.0, 0.25, 0.50, and 0.75 are indicated for the B-band ellipse. Arrows show the direction of circumvention, which is clockwise. The eccentricity of ellipse e gives the inclination of a binary orbit i (e = sin ²i∕(1 + cos²i)) and the angle between the major axis and the q-axis gives the orientation of orbit Ω.