MATLAB: Using hold on function in step response with subplot

hold onsubplot

I am trying to plot step reponse and impulse reponse of a sys in a single plot,using suplot and lengend, but i too have different values of z to be ploted (means i am using hold on fun). when i try to use subplot with the created code it's plotting for only one value of z, but i want such that all the three values of z has to plotted for both the step and impulse function in subplot, I apperciate your help. 
s=tf('s');
z=[3 6 12];
hold on
for i=1:3
    zc=z(i);
    g=(15/zc)*((s+zc)/(s^2+3*s+15));
    subplot(2,1,1)
    step(g)
    subplot(2,1,2)
    impulse(g)
end
legend('z = 3','z = 6','z = 12')

Best Answer

Code attached. Mostly it was moving the hold()
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