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Figure 3 (Left panel) Relationship between mean coronary flow velocity reserve (CFVR) obtained using the transthoracic and intracoronary Doppler methods. (Right panel) Plot of the difference between CFVRs obtained using the two aforementioned methods against their average. Open circles = CFVR measurements in the distal right coronary artery and posterior descending artery; closed circles = CFVR measurements in the left anterior descending coronary artery.