make_flow_example(n) will create a list of n points in 
the plane, with cooridinate chosen uniformly in [0,1], 
then take the Delaunay triangulation of these points and 
compute the flows corresponding to both the 'thin' central 
region and the 'thick' central region.

Other scripts in the directory can be used to choose other 
triangulations, such as the Delaunay trianguation of n 
random points on the circle and some of the `special' 
configurations mentioned in the talk.

MATLAB graphics may choke a bit for values bigger than n=100;