So there's m times n minus 1 degrees of freedom. And in this case, in particular, each group, n minus 1 is 2, or in each case, you had 2 degrees of freedom. And there's 3 groups of that, so there are 6 degrees of freedom. There are 6 degrees of freedom. Let me write 6 degrees of freedom. In the future, we might do a more detailed discussion of what degrees of freedom mean and how to mathematically think about it. But the simplest way to think about it is really, truly independent data points, assuming you knew, in this case, the central statistic that we use to calculate the squared distance in each of them.