A diagrammatic representation of scattering data on large particles, obtained at different angles but at the same concentration, constructed by plotting (sin θ2)2.ΔR(θ) vs. (sin θ2)2, or q 2 Δ R θ vs. q and used for the determination of molecular shape. ΔRθ is the excess Rayleigh ratio, P θ the particle scattering function, θ the scattering angle and q the length of the scattering vector.