Lightcurves computed using Mie theory for a spherical planet (solid lines) and a planet of oblateness η = 0.3 (dotted lines), for inclination angles of θ_incl = 90° (top panel), θ_incl = 60° (middle panel), and θ_incl = 30° (bottom panel). The top subpanels show the Stokes vector elements I_da/I₀, Q_da/I₀, and U_da/I₀ from left to right, and the bottom subpanels show the resulting degree of linear polarization p_da/I₀ (in %).