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\end{equation}  where $A$ is a constant and $\phi$ is the rotational correlation time. If the rotating unit is not spherical, a more complex model is required.  $\phi$ can thus be obtained by fitting eq~\ref{eq:1expfit} (or the more complex model) to the experimental anisotropy decay. $\phi$ is related to the volume $V$, and thus the effective radius, of the rotating molecule by Stokes-Einstein-Debye(SED)  equation \cite{VanHolde1998} \begin{equation}  \phi = \frac{\eta V}{kT} \label{eq:SED}  \end{equation}