GRAPH4:  This a graph of the gradient of the potential resulting from the 
matlab handout Professor Lockhart compiled using the example of two point 
charges, each having a 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 
located at (1.95,1.95).  This graph is a view from AZ=30, EL=0.