Table 1: Variance analysis to estimate the noise level.

Figure 2(c)Figure 2(d)
Real SD 5 10 15 5 10 15
NO. ESD Diff ESD Diff ESD Diff ESD Diff ESD Diff ESD Diff

21 4.93 0.26 9.82 1.07 14.67 0.61 4.95 0.52 9.65 −0.26 14.42 3.75
22 4.94 0.10 9.86 0.78 14.78 3.00 4.96 0.15 9.69 0.90 14.45 0.95
23 4.91 9.82 14.74 4.98 0.19 9.75 1.20 14.50 1.53
24 4.88 9.75 14.62 4.98 0.19 9.75 1.20 14.52 0.34
254.90 0.22 9.81 1.1914.71 2.63 5.13 0.80 9.82 0.53 14.68 4.80
26 6.61 19.68 10.76 19.64 15.34 18.71 5.20 0.69 9.94 2.42 14.77 2.42
27 5.25 0.51 10.02 1.52 14.87 3.17
285.30 0.54 10.04 0.42 14.89 0.53
29 5.947.24 10.35 6.17 14.98 2.73
3015.32 10.38