So let's just go with the same three subdivisions, but now let's use the right side of each of these subdivisions to define the height. So for this first rectangle, the height is going to be defined by g of four, so that's right over there. And then for the second one, it's going to be g of six, so that is right over there. And for the third one, it's going to be g of eight. And so let me shade these in to make it clear which rectangles we're talking about. This would be the right Riemann sum to approximate the area. And it's very clear here that this is going to be an underestimate, underestimate, because we see in each of these intervals, the Riemann, the right Riemann sum, or the rectangle that we're using for the right Riemann sum is a subset of the area that it's trying to estimate.