Fig. 2
From: FastICA peel-off for ECG interference removal from surface EMG
a One channel of the contaminated EMG signal (SIR = 13.2). ECG interference in the signal was marked by bold line; b the output of FastICA; c the ECG spike train estimated from b, which has false spikes (as indicated by red circle) and missing spikes (indicated by red triangle); d the output of constrained FastICA (using the spike train shown in c as a constraint); e the ECG spike train estimated from d, which is perfectly match the real ECG firing spike train