And for the red curve, the corden point is around 0.1. And what that means is, for that black curve, when we have a PH of 7.4 and no carbon dioxide present inside our exercising tissues, the hemoglobin will be 32% saturated with oxygen. However, if we drop the PH to about 7.2, and once again, no CO2 is present, now, in the exercising tissues, the hemoglobin will be able to unload more oxygen, because our fractional saturation drops. We now have about 20% saturation of hemoglobin. And finally, if we drop the PH and we increase the concentration of carbon dioxide to about 40 mercury, then at a partial pressure of 20 mercury for oxygen, inside the exciting tissues, we're going to have 10% saturation of hemoglobin. And so, these will be the percentages of hemoglobin that are going to be able to unload and release that oxygen.