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Figure 3 (A) Bland-Altman plot of magnetic resonance-derived versus transesophageal echocardiography-derived aortic valve area, showing no difference in the variability depending on the magnitude of the measurement and no significant bias. (B) Bland-Altman plot of the Doppler gradient versus catheter gradient, showing no significant bias between Doppler- and catheter-derived pressure gradients. Variability between the two is independent of the magnitude of the data. SD = standard deviation.