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. 2017 Jan 30;17(2):272. doi: 10.3390/s17020272

Figure 9.

Figure 9

Figure 9

(a) Distribution of the 80 characteristic values for sensor 1 and sensor 2; (b) the distribution of the 80 characteristic values for sensor 3 and sensor 4; (c) distribution of the 80 characteristic values for sensor 5 and sensor 6; (d) distribution of the 80 characteristic values for sensor 7 and sensor 8.