A diagrammatic representation of data on scattering from large particles, obtained at different angles but at the same concentration, constructed by plotting ${\log }_{10}\mathrm{\Delta }R\left(\theta \right)$ or ${\log }_{10}P\left(\theta \right)$ versus $(\sin \frac{\theta }{2}{)}^2$ or $q^2$ and (usually) used for the evaluation of the radius of gyration. $\mathrm{\Delta }R(\theta )$ is the excess Rayleigh ratio, $P\left(\theta \right)$ the particle scattering function, $\theta$ the scattering angle and $q$ the length of the scattering vector.