Fig. 4: Bland-Altman plots of the R and T amplitudes in Lead V6 for real and generated ECG data.

a, b R peak amplitude in Lead V6, c, d T peak amplitude in Lead V6. Panels (a) and (c) show results from the 1-lead reconstruction, panels (b) and (d) show results from the 2-lead reconstruction (n = 952 independent samples). The plots display the reconstruction error (generated - real) against the amplitude of the real electrocardiograms in lead V6. Each point represents a sample. The dashed lines denote the mean error and the limits of agreement at ±0.96 standard deviations. The coefficient of determination (R2) quantifies the correlation between real and generated data. Amplitudes are measured in microvolts (μV).