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Figure 4 Relationship between coarctation (CoA) index and peak systolic gradient (a), end-diastolic tail velocity (b), diastolic velocity (c), systolic/diastolic velocity ratio (d), diastolic velocity half-time index (e), and diastolic pressure half-time index (f) in patients from group 1 before and after stenting. Filled circles = observed; line = inverse.