Biases in the tomographic reconstruction for one single conical shell. Top panels: Black curves show computed transverse PV diagrams for one conical layer with constant V_Z, V_R, and j seen at different inclinations i and with θ_V = θ = 17°. The red dashed curve traces an elliptical fit. Bottom Panel: Computed relative bias in V_Z (green curves) and j (orange curves) for one conical layer as a function of the inclination and for different combinations of θ and θ_v: solid curves: θ = θ_v = 17°, dotted curves: θ = 17° & θ_v = 30°, and dashed curves: θ = θ_v = 30°.