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Figure 4 Flow-function relation in Group 2 dogs. Red denotes the central portion of the perfusion defect corresponding to hypoperfused zone in panel C in Figure 3. Green denotes the collateral blood flow-supplied zone within the perfusion defect (that seen in lateral portions of the perfusion defect in panel A in Figure 3). Blue denotes the normal remote myocardium. MBF = myocardial blood flow; WT = wall thickening.