Now let's take a look at the following diagram. So, what this diagram basically describes is the oxygen binding curve for the T state. And it is described by this shallow curve here. And this R state is described by this steep curve right over here. And to actually obtain that Sigmoidal curve that we actually see for the hemoglobin oxygen binding, we have to combine these two curves to basically get this Sigmoidal curve. So the Sigmoidal curve for hemoglobin is formed from the combination of the T state curve, this curve here, the shallow one, and the steep one, the R state curve.