Set a requirement for step response, like settling

问题:

I'm trying to find the step response of the system below in picture and I need to find settling time, overshoot and static error of output. How can I find them? Is what I programmed correct?

Matlab code :

A=[0,1,0,0;0,-42.44,212.24,0;0,0,0,1;0,0,0,-42.44];
B=[0;106.12;0;78.6];
C=[1,0,0,0;0,1,0,0;0,0,1,0;0,0,0,1];
D=0;
sys = ss(A, B, C, D)
t=0:0.1:10;
figure;
step(sys,t,'r')

The system