 So in essence, every time your heart beats, pumps its blood all around, and the pressure tells us how hard your heart is working. So if you have like 140 over 80, we would go, whoops, your heart's pushing really hard to your body. And if you have 120 over 100, we go, whoops, your heart's pushing really hard into your lungs. So we can also find out where the problems are. Is it a systemic issue? Is it a lung issue?