URL: https://www.researchgate.net/profile/Yoshiaki-Sugawara/publication/51873070/figure/fig2/AS:305917364064260@1449947791586/pH-temperature-diagram-of-hemichrome-formation-for-human-HbO-2-A-redrawn_Q640.jpg
URL2: https://www.researchgate.net/figure/pH-temperature-diagram-of-hemichrome-formation-for-human-HbO-2-A-redrawn_fig2_51873070
