Table 1 Data of 3-position-voltage measurements at each labeled cross (from 1A to 5E) in Fig. 2. Voltage (V) A B C D E Average 1 8.33 8.31 8.50 8.30 8.30 8.27 8.38 8.39 8.44 8.43 8.40 8.35 8.50 8.40 8.42 8.38 2 6.78 6.76 6.88 6.86 6.81 6.82 6.96 7.03 6.80 6.84 6.86 6.83 6.92 6.81 6.80 6.85 3 5.20 5.20 5.18 5.27 5.26 5.26 5.24 5.24 5.26 5.24 5.16 5.12 5.26 5.24 5.26 5.23 4 3.60 3.55 3.54 3.64 3.55 3.55 3.62 3.64 3.59 3.52 3.53 3.52 3.56 3.54 3.55 3.57 5 1.94 1.94 2.07 1.89 1.96 1.96 1.92 1.80 1.95 1.89 1.92 1.95 1.97 1.96 1.95 1.94