A diagrammatic representation of scattering data on large particles, obtained at different angles but at the same concentration, constructed by plotting \((\sin \frac{\theta }{2})^{2}\ \Delta R\left(\theta \right)\) vs. \((\sin \frac{\theta}{2})^{2}\), or \(q^{2}\ \Delta R\left(\theta \right)\) vs. \(q\) and used for the determination of molecular shape. \(\Delta R(\theta)\) is the excess Rayleigh ratio, \(P(\theta)\) the particle scattering function, \(\theta \) the scattering angle and \(q\) the length of the scattering vector.