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\section{Jeremie's Experiment: Clustering}  When there are many swimmers, they form clusters (read \cite{http://adsabs.harvard.edu/abs/2012PhRvL.108z8303T} \citet{http://adsabs.harvard.edu/abs/2012PhRvL.108z8303T}  and others). These clusters are very dynamic / ``liquid''. I want to understand:  \begin{enumerate}