Gp(s) = (\(\frac{Kp}{sT+1}\) ) \(e^{-sL}\) (sorry the delayed should go a slightly more upward) and then superimpose the unit step response from the estimated first-order plus dead-time model on the experiment.

I'm not quite sure how to do this using matlab, I meant the superimpose part.

from Gp(s) with unit step response input, I could find the y(s) and in time domain y(t)=Kp(1 - \( e^{(-t+L)/T}\))*1(t-L)

I know we could use something called "hold on" or "hold off" in matlab, but when I tried to type in the formula of y(t). the errors come out.. can anyone advise please.