Fig. 2From: Elevated nitric oxide and carbon monoxide concentration in nasal-paranasal sinus air as a diagnostic tool of migraine: a case – control studyA = The receiver characteristic operating (ROC) curve and predicted probabilities for CO (Right). B = The receiver characteristic operating (ROC) curve and predicted probabilities for exhaled NO. C = The receiver characteristic operating (ROC) curve and predicted probabilities for exhaled COBack to article page