Well, that basically means when our red blood cells carrying the hemoglobin arrive at the tissues that hemoglobin, some of that hemoglobin will unload that oxygen and the oxygen will readily transfer to the tissues as a result of that difference in partial pressure. And so what this graph tells us is our percent saturation will be somewhere in the 70s, which is lower than what it is within our lungs. Within the lungs, it's about 98% because most of that oxygen is picked up. But within the tissue, we begin the process of unloading. So the hemoglobin, some of it dissociates the oxygen. And so now not all of it is fully saturated.