So it might look, I don't know, something like this. I don't know if it's a line or not, it might be some type of a curve, but it would definitely have a trend something like that. Now we can immediately tell that this blue graph is not the derivative of this orange graph. Its trend is opposite. Over that interval, it's going from being negative to positive as opposed to going from positive to negative. So we can rule out the blue graph as being the derivative of the orange graph. But what about this magenta graph?