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\item {\it What does the scatter in trajectories tell us about the system?} Anything useful? Use linear-response theory (is this justified? Why?).  \end{enumerate}   \item Now consider active particle in concentration gradient.  {\it Do we get a simple superposition of two behaviours?} \begin{itemize}  \item Re-read \citet{2005PhRvL..94v0801G}. Read \citet{2009JPCM...21t4104G}.  \end{itemize}