I mean, this is really dramatic. We don't see it that good, but every now and then, you will see a good clearing like that. And what happened. Laplace 's law. We opened up all those little microalveoli because we put in the surfactant, we reduced the surface tension, and the lungs opened up, so we can see less opaque on the x-ray. So this is what surfactant is all about, and why we have such great survival now.