\caption{Distribution of distances to the {\emphmathgen} nearest neighbour. In blue for a set of {\emph non-mathgen} paper. In red for a set of {\emph mathgen} paper}
\caption{Distribution of distances to the {\emphscigen-physics} nearest neighbour. In blue for a set of {\emph non-scigen-physics} paper. In red for a set of {\emph scigen-physics} paper}
\caption{Distribution of distances to the {\emphscigen-physics} nearest neighbour. In blue for a set of {\emph non-scigen-physics} paper. In red for a set of {\emph scigen-physics} paper}
\caption{Distribution of distances to the {\emphmathgen} nearest neighbour. In blue for a set of {\emph non-mathgen} paper. In red for a set of {\emph mathgen} paper}
\end{center}
\end{figure}
\paragraph{propgen}
\url{http://www.nadovich.com/chris/randprop/} ( dir {\tt data/samples/Propgen)};