GRAPH1:  This is a graph of the potential resulting from the matlab handout 
Professor Lockhart compiled using the example of two point charges, each 
having magnitude of unity but opposite in charge.  The Cartesian 
Coordinate System was used in the evaluation of the problem with the 
positive charge located at (0.95,0.95) and the negative charge at 
(1.95,1.95).  This graph of the potential is a view from AZ=-37.5 and EL=30.