Now one thing that might be causing some unease to immediately say that this last graph is the derivative of the first one is we're not used to situations where the derivative has more extreme points, more minima and maxima, than the original function. But in this case, it could just be because we don't see the entire original function. So for example, if this last graph is indeed the derivative of this first graph, then what we see is our derivative is our graph, our derivative is negative right over here, but then right around here, it starts becoming less negative. So if that point corresponds to roughly right over there, then over here, our slope will become less and less and less negative. And then at this point, our slope would become zero, which would be right around there. So for example, our graph might look something like this. We just didn't see it.