And it's going to have some area on top of it that is a function of any given y that I have. So the volume of a given disk is going to be the area as a function of y times the depth of the disk times dy. And then we just have to integrate it over the interval that we care about. And we're doing it all in terms of y. And in this case, we're going to integrate from y is equal to well, this is going to hit this y intercept right over here. So y is equal to negative 1. And let's go all the way to y is equal to 3. y is equal to 3 right over here.