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PPG signal recordings in the red 660 nm (top row) and infrared 940 nm (bottom row) channels while pumping blood mimicking fluid through (a) a molded PDMS turbid phantom with silicone tubing; (b) a molded PDMS turbid phantom with PVC tubing; and (c) a 3D-printed Elastic 50A turbid fingertip phantom with tube-less channels.
