N
e ( u )
e ( σ )
100
4.67 × 10−1
4.30 × 10−1
200
1.11 × 10−2
1.04 × 10−1
400
5.92 × 10−3
7.26 × 10−2
1600
8.61 × 10−4
3.57 × 10−2