Plotter Functionality

• Potential
  The potential is shown in the upper right quadrant with color coding from red at the value set at the circle to blue at the value at the border. Black indicates regions where the potential is exactly the same as the circle boundary and white indicates regions where the potential is exactly the same as the bounding rectangle.
• Convergence
  The convergence error is shown in the lower right quadrant with error defined as the mean square difference in the value of the potential at each lattice point.