Table 4: Successful trials in detecting slopes. In the detection of the slope angle, detected data are averaged with 100 trials.

Real slope angle (deg.)Successful detection rateMean value (deg.)Max. value (deg.)Min. value (deg.)Variance (deg.)

100/100 0.926
100/100 0.261
10.0100/10010.310.99.520.0748
20.0100/10021.422.320.10.168