. 2018 May 22;6:64. doi: 10.3389/fbioe.2018.00064
Copyright © 2018 Dagdanpurev, Sun, Shinba, Kobayashi, Kariya, Choimaa, Batsuuri, Kim, Suzuki and Matsui.
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Figure 5.
Scatter plots for (A) HR, (B) HF, and (C) LF/HF values derived from ECG and PPG sensors.