Let's call this q, let me do it in a different color. Let me do q2 in blue. Let's say I have another random variable q2. That is defined as, let's say I have one independent, standard normally distributed variable. I'll call that x1, and I square it. And then I have another independent, standard normally distributed variable x2, and I square it. So you can imagine, both of these guys have distributions like this, and they're independent.