How much can hemoglobin deliver if our tissues are exercising? Well, in the case of the exercising tissue, the partial pressure is at 20 mercury. And we see that because we have this sigmoidal shape curve, there is a drastic drop in our fractional saturation of hemoglobin. So we go from here to about here. And this wide valley corresponds to about zero point 32. And that means when our tissue is exercising, 32% of that hemoglobin is fully saturated with oxygen.