And then the height is Y. So the height is going to be whatever our Y value is. And then if we wanted to calculate the volume of just a little bit, a slice that has an infinitesimal depth, we could think about that infinitesimal depth in terms of Y. So we could say its depth right over here is DY, DY. And we could draw other cross sections. For example, right over here, our Y is much lower. It might look some, so our height will be like that.