Fig. 6From: A novel particle filtering method for estimation of pulse pressure variation during spontaneous breathing Top Original ABP signal (red) with its manually annotated envelopes (black) and signal estimates (green) with its automatically computed envelopes (purple). Bottom Manual \(\mathrm {PP}\) signal (red) and automatic \(\mathrm {PP}\) signal (green) where the manual \(\mathrm {PP}\) signal increases momentarily due to a contaminated heart beat in the ABP signalBack to article page