Need to create surface and contour plots of potential and electric field distribution

I am given this image. I need to create a program to show the potential distribution and electric field distribution, surface and contour for each. So far i have solved the BVP and have started my code. This is what i have.. any help would be greatly appreciated.

clear all;

    V = [];
    Vo = 12.0;
    a = 0.12;
    b = .3;
    x = b/4;
    y = 3.*a/4;
    c = 4.*Vo./pi;
    sum = 0.0;
    for k=1:10
        n = 2*k - 1;
        a1 = sin(n*pi*x/b);
        a2 = sinh(n*pi*y/b);
        a3 = n*sinh(n*pi*a/b);
        sum = sum + c*a1*a2/a3;
        V = [n, sum]

    end

mesh(V)

xlabel('sum');
ylabel('n');