| http://www.w3.org/ns/prov#value | - Hence, the weighting factor for PPG signal 404 has optionally been chosen so that weighted PPG signal 404 is approximately equal to IPG signal 402 during an interval late in each cardiac cycle, for example during the last third of each cardiac cycle, when the blood pressure and signals 402 and 404 are falling, before the next peak of the R-wave.
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