Relating oxygen partial pressure, saturation and content: the haemoglobin–oxygen dissociation curve

Julie-Ann Collins,corresponding author1,2 Aram Rudenski,3 John Gibson,4 Luke Howard,5 and Ronan O’Driscoll6
Breathe (Sheff). 2015 Sep; 11(3): 194–201

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4666443/