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Figure 1 (a) Scatter plot of coronary flow reserve (CFR) values derived by thermodilution (CFR thermo) and from pressure measurements alone (CFR pressure) in hemodynamically significant atherosclerotic lesions in human coronary arteries (protocol 1). (b) Bland-Altman plot showing the relationship of the difference between pressure-derived and thermodilution-derived CFR and the mean of the two values.