So let's say that this is, let's say that this is a right over here. Capital F of a is just literally the area between c and a under the curve, lowercase f of t. So it's this right over here. It's all of this business, all of this right over here. So what is, if you have this blue area, which is all of this, and you subtract out this red, this magenta area, what are you left with? Well, you're left with this green area. You're left with this green area right over here. And how would we represent that?