Shaded region inside plot

Hello, I want to ask is it possible to shade thses 4 region with different colour?

x=[0:0.001:20];

y=(1/(2*0.2*9.81))*x.^2;

z=x*(10*3.7/(((3)^(1/2))*0.2*9.81))^(1/2);

plot(x,y,'m-', 'LineWidth', 3);

hold on;

plot(x,z,'k-', 'LineWidth', 3);

hold on;

x2 = [x,fliplr(x)];

y2 = [y,fliplr(z)];

fill(x2,y2,'b','LineStyle','none');

Answer 1

[Voss]

x=[0:0.001:20];
y=(1/(2*0.2*9.81))*x.^2;
z=x*(10*3.7/(((3)^(1/2))*0.2*9.81))^(1/2);

colors = [ ...
    1 1 0; ...    % 1: yellow
    0 1 0; ...    % 2: green
    0 1 1; ...    % 3: cyan
    0.5 0.5 0.5]; % 4: grey
idx = find(y > z,1);
fill( ...
    [x x(end) x(1)], ...
    [z(1:idx) y(idx+1:end) 120 120], ...
    colors(1,:),'LineStyle','none');
hold on
fill( ...
    [x(1:idx-1) x(idx-1:-1:1)], ...
    [z(1:idx-1) y(idx-1:-1:1)], ...
    colors(2,:),'LineStyle','none');
fill( ...
    [x(idx:end) x(end:-1:idx)], ...
    [y(idx:end) z(end:-1:idx)], ...
    colors(3,:),'LineStyle','none');
fill( ...
    [x x(end) x(1)], ...
    [y(1:idx) z(idx+1:end) 0 0], ...
    colors(4,:),'LineStyle','none');

% plot the y and z lines last so they aren't obscured by the fills
plot(x,y,'m-', 'LineWidth', 3);
plot(x,z,'k-', 'LineWidth', 3);

[LIM MING HUI]

Thanks for your help!

[Voss]

You're welcome!