stretch the figure a bit more

\begin{figure}[h]

\centering

\mbox{\epsfig{figure=interaction,width=8cm}}

\mbox{\epsfig{figure=interaction,width=8.75cm}}

\caption{Alice builds a two-hop circuit and begins fetching a web page.}

\label{fig:interaction}

\end{figure}

\SubSection{Rate limiting and fairness}

\label{subsec:rate-limit}

Volunteers are generally more willing to run services that can limit

their own bandwidth usage. To accommodate them, Tor servers use a

Volunteers are more willing to run services that can limit

their bandwidth usage. To accommodate them, Tor servers use a

token bucket approach~\cite{tannenbaum96} to

enforce a long-term average rate of incoming bytes, while still

permitting short-term bursts above the allowed bandwidth.

 We thank Peter Palfrader, Geoff Goodell, Adam Shostack, Joseph Sokol-Margolis,

   John Bashinski, and Zack Brown

   for editing and comments;

 Matej Pfajfar, Andrei Serjantov, Marc Rennhard: for design discussions.

 Matej Pfajfar, Andrei Serjantov, Marc Rennhard for design discussions;

 Bram Cohen for congestion control discussions;

 Adam Back for suggesting telescoping circuits; and

 Cathy Meadows for formal analysis of the \emph{extend} protocol.