n

ε ˜ n (WM)

ε ˜ n (FM)

2 k ρ 2 ( ε ˜ n ε ˜ 0 ) (FM)

Ref. [8]

0

−643.845703

−643.84571

0

0

1

−643.83502

−643.83499

0.742728866

0.83

2

−630.4740

−630.47403

926.9789526

935

3

−630.041077

−630.04109

956.9925447

961