So they've plotted time, or they've plotted gallons per minute versus time within minutes. And so we see here, this blue line, this is the rate at which water drained from the tub, rate at which water drained from the hot tub. So at minute zero, the water wasn't really draining from the hot tub, and then more, not just more drained, but the rate at which the water was draining increased. So 10 minutes into his bath, the water was draining at a gallon per minute, and then 20 minutes into his bath, water was draining at two gallons per minute. And then he noticed it, and he opens the drain. I guess he wants to accelerate the end of his bath. So he opens the drain, and then all of a sudden, water starts draining out at a much higher rate, at 20 gallons per minute, but then that decreases.