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\label{fig:results} A plot of viscosity against rotational correlation time yields a straight line passing through the origin for all data sets. The radius of the molecule can be calculated from the gradient with eq~\ref{eq:R_h}. The error in the x-axis was derived from the uncertainty in the measured refractive index, and the y-axis error from the uncertainty of the fit to the anisotropy using standard error propagation.