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. 2014 Jul 7;9(7):e100915. doi: 10.1371/journal.pone.0100915

Figure 1. Bluetooth signal strength (RSSI) as a function of distance.

Figure 1

A: Scans between two phones. Measurements are per distance performed every five minutes over the course of 7 days. Mean value and standard deviation per distance are respectively Inline graphic Inline graphic Inline graphic and Inline graphic. B: Average of the values in respective time-bins. Summary statistics are: Inline graphic Inline graphic Inline graphic and Inline graphic. C: Maximal value per time-bin. The mean value and standard deviation per distance are: Inline graphic Inline graphic, Inline graphic, and Inline graphic The measurements cover hypothetical situations where individuals are far from each other and on either side of a wall.