Given a 2nd order system response, how to get equation ?

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integralx2
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I have a 2nd order system response on a graph. How would I go about this to develop the equation that models this system in s- domain when its graphed in time domain like I have ?
 
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integralx2 said:
I have a 2nd order system response on a graph. How would I go about this to develop the equation that models this system in s- domain when its graphed in time domain like I have ?

Welcome to the PF.

What is the context of the question? What is the system? Can you post the graph? What was the stimulus to create this time domain response graph?