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World J Cardiol. Mar 26, 2026; 18(3): 116299
Published online Mar 26, 2026. doi: 10.4330/wjc.v18.i3.116299
Figure 2
Figure 2 All the electrocardiograms have a notch filter (60 Hz in this example) and the low- to high-pass filter mentioned in the footnote (arrow).


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