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. 2020 Sep 18;20(18):5361. doi: 10.3390/s20185361

Figure 9.

Figure 9

Error affecting the estimates of the distance between the anchor unit and the radio tag for different orientations of the antennas. The error is higher for orientation 4 where both the antenna of the anchor unit and the antenna of the radio tag are aligned. The red dots represent the tested data points. The blue areas represent the variance of the estimates.