Figure 9.10 on page 377 is very significant. This figure shows the saturation curve of haemoglobin as it moves from low oxygen concentration to high.
This is a great example of the cooperativity effect, particularly in proteins.
It is also biologically relevant, concerning a process that occurs while we breathe.
It can relate information on the structure of haemoglobin without the use of imaging techniques. As fitting the data estimates that haemoglobin is made up of more than one oxygen-binding subunit, which is in fact true.