%plots the real part of the worst pole vs. valve opening

z=[0.1 0.15 0.18 0.20 0.22 0.25 0.3 0.4 0.6 0.8 1];
p=[-0.0246 -0.0133 -0.0030 0.0047 0.0131 0.0268 0.0522 0.1100 0.2365 0.3561 0.4565];
k=[0 0 0 0 0 0 0 0 0 0 0];
figure(1)
plot(z,p,z,k,'--')
ylabel('Real part of the worst pole')
xlabel('valve opening, z [-]')
