I was trying to model explosion and obtained P(t) curve via Gauge point. Now, I would like to get impulse result for that P(t) curve. In the History menu when you make P(t) curve there is an option INTEGRATE bellow. I guess it is here for impulse calculation, but I usually get bad results. How to get accurate reading of impulse for particular P(t) curve since when I do INTEGRATE, I get another curve?