And that makes a lot of sense because you're looking at your spread of y over your spread of x. If r were equal to one, this would be your slope, standard deviation of y over standard deviation of x. That has parallels to when you first learn about slope. Change in y over change in x. Here you're seeing the, you could say the average spread in y over the average spread in x. And this would be the case when r is one. So let me write that down.