And let's see, we care about the interval from time going from time one, time one, to time two, time two. I'm not really drawing the axes completely at scale. Let me just assume that there's a gap here, just because I don't want to, I don't want to, I actually want to, don't make you think that I'm drawing it completely at scale, because I really want to focus on this part of the interval. So this is time equals two, two hours. And so at time equal one, you're right over here. And let's say this position is, we'll just call that S of one. And at time two, at time two, you're at this position right over here.