So, in this particular case, the black curve, tells us 98% -32% gives us 66% of the hemoglobin will be able to release the oxygen to the tissues, in the case of the absence of carbon dioxide, but a lower PH. So a higher concentration of hydrogen ions, we're going to be able to unload 98 -21 or 77% of that oxygen. So, 77% of the hemoglobin will unload and release that oxygen, and finally, for this case, in the presence of carbon dioxide, and a lower PH meaning a higher concentration of H plus ions, 88% of the hemoglobin will be able to unload that oxygen. So, we see not only does two three BPG shift the curve to the right side and lower the affinity of hemoglobin for oxygen, but so does the hydrogen ion concentration and the carbon dioxide concentration. And these three molecules, 23 BPG, H plus ions, and CO2 molecules together create a very effective hemoglobin molecule that is able to actually unload a lot of many of those oxygen molecules to the tissues of our body. So a higher concentration of CO2 and a lower PH, meaning a higher amount of H plus ions.