%------------------------
% Use this code to hold
% either a maximum of a
% minimum value of PHI
% in a color plot.
%------------------------
Phi=100;
hold on
x(1)=0;
x(2)=0;
y(1)=0;
y(2)=0;
g(1)=Phi;
g(2)=Phi;
fill(x,y,g)

Phi=48;
x(1)=0;
x(2)=0;
y(1)=0;
y(2)=0;
g(1)=Phi;
g(2)=Phi;
fill(x,y,g)
%  colorbar('vert')

