Why you need to determine this? If only if you are interested in calculating the total maximum force, what are we having here? In this plot, we are having only the total force variation, how the total force varies at a given elevation, as a function of phase that is all this gives. So, one way is, you pick up the force at each elevation, the maximum force pick up at this elevation, the maximum force at this elevation maximum force etcetera. So, what will happen?