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. 2008 Mar 12;3(3):e1751. doi: 10.1371/journal.pone.0001751

Figure 2. Plot of Physiological Signal Artifact.

Figure 2

The raw respiratory and cardiac waveforms are plotted along with their filtered versions. Signal artifacts with large residuals (Raw Signal-Filtered Signal) are replaced with a spline interpolation. The series of green spline circles are the thick black waveform.