Figure 4From: Comparison of spectral estimators for characterizing fractionated atrial electrogramsExample of removal of harmonics from the ensemble average of the DF, which is done for the NSH estimator implementation. Panel A: Original signal. Panel B: The ensemble average of the dominant frequency with antisymmetry imparted to the second harmonic. Panel C: Addition of the antisymmetric components of the ensemble average in panel B results in the zero vector.Back to article page