And so for a function like that, the left edge, the value of the function at the left edge is going to be just as high or higher than any other value, than any other value the function takes on over that interval for the subdivision. And so you get left with all of this extra area that is part of the overestimate or this area that is larger than the actual area that you're trying to approximate. Now let's think about a right Riemann sum. And I'll do different subdivisions. Let's say the first subdivision goes from negative seven to negative five. And here we would use the right edge to define the height. So f of negative five or g of negative five, I should say.