ochester, MN
</pre><h2>Minimum spanning trees<a name="14"></a></h2>
         <p>A minimum spanning tree is a set of edges from a graph that ...</p>
         <p>This demo requires the mapping toolbox for maximum effect, but we'll do okay without it.</p>
         <p>Our data comes from a graph Brendan Frey prepared for his affinity propagation clustering tool.  For 456 cities in the US,
            we have the mean travel time between airports in those cities, along with their latitude and longitude.
        