Variability in the observed polarization for HD 165052 plotted on the Stokes (q, u) plane, represented by the ellipses of second harmonics of the Fourier fit. Blue, green, and red represent B, V, and R passbands, respectively. The clockwise direction and phases of the orbital period are shown for the B band ellipse. The angle between the major axis and the q-axis gives the orientation, Ω.