P_r

M

N

[19]

[20]

[21]

Present results

1

0

0

0.9548

0.9548

0.9548

0.9548

2

0

0

1.4714

1.4714

1.4714

1.4715

3

0

0

1.8691

1.8691

1.8691

1.8692

1

0

1.0

0.5315

0.5312

0.5312

0.5311

1

1.0

0

---

0.8611

0.8611

0.8611

1

1.0

1.0

---

0.4505

0.4505

0.4505