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Correlations between remote and pulse oximetry-based PPG as a function of video length per recorded body part (with all filters applied: ICA + LF + Resp). Video length, on the x-axis, means that the data were analyzed in the period from the sixth second until the xth second of the video. Note that the first and last 3 s of the video were not analyzed (see the Method section), and correlations can only be calculated with a minimum of three data points
