And the x axis is the partial pressure of oxygen in the tissues given in millimeters of Mercury. Now, the blue curve describes the dissociation curve for when we don't have any of these factors in place. So this is the normal dissociation curve. But if we increase our hydrogen ion concentration, thereby decreasing our PH, what that does is it shifts the entire curve to the right side and we get the following dashed curve. And what that means is, at the same exact partial pressure of oxygen, we're going to have a smaller concentration percent saturation of hemoglobin. And so more of that oxygen will be released to the cells of our tissue.