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. 2018 Aug 3;18(8):2541. doi: 10.3390/s18082541

Figure 7.

Figure 7

Simultaneous RR interval (R-to-R) (ms) measurements for Cow I during 27 min of recording after outlier removal and interpolation acquired with smartphone IoTool application and Polar watch V800 (r = 0.98; p < 0.001).