ers</h3>

<P>
<TABLE border>
<TR>
<th>Parameter</th><th>Description</th>
</tr>
<tr><td><tt>Graph</tt> </td>
<td> A graph type modeling <a href="VertexMutableGraph.html">VertexMutableGraph</a>
  and <a href="EdgeMutableGraph.html">EdgeMutableGraph</a>. Also
  the graph must have internal <tt>vertex_index</tt> and
  <tt>edge_index</tt> properties. The vertex indices must be maintained
  automatically by the graph, whereas the edge indices will be
  assigned by the <tt>subgraph</tt> class implementation. </td>