\begin{figure}[!h]
\begin{center}
\includegraphics[width=4in]{figures/3a.png}
\end{center}
\caption[Displaying a 100-D space of documents]{A 100-D space presented in 3-D.
The point in red shows the current design and the four points in green
show the nearest 4 technical documents (and the gray points show other documents
that have been ``trimmed'' away using the techniques discussed below).}\label{fig:3d}
\end{figure}

