So fully relaxed and fully contracted. Now, as we move down the volume inside the space increases and that decreases the pressure inside the intraplural space. Eventually, the pressure at the end of the contraction is less than the atmospheric pressure that is given by the following blue line. At that point, we have this difference in pressure known as the pressure difference or the negative pressure difference. And that creates that pressure gradient that is needed to actually allow the movement of the air from the outside environment and into our lungs. At this point, air rushes into the lungs and inhalation actually takes place.