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Figure 5 (A) Linear regression analyses of shunt flow volumes through atrial septal defects (ASDs) and pulmonary minus systemic flow (Q_p minus Q_s) in patients obtained by the new digital semiautomatic method (ACM). (B) Agreements for flow volumes through ASDs and Q_p minus Q_s obtained by ACM examined according to the method of Bland and Altman (18). SEE = standard error of estimate.