$n\to 2n$

NCO₀

NCO₁

NCO₂

NCO₃

$20\to 40$

6.9624

4.3838

3.0215

2.0837

$40\to 80$

6.9906

4.1185

3.0055

2.0226

$80\to 160$

6.6241

4.0314

3.0014

2.0057

理论值

5

4

3

2