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. 2012 Aug;8(3):215–219. doi: 10.2174/157340312803217184

Fig. (5).

Fig. (5)

Overall terminologies published in English literature ”dashed line” while the”solid line” in Japanese literature. It is clear that PPG is the most used acronym for photoplethysmogram and APG is the most used acronym for the second derivative of the photoplethysmogram signal.