R_SN/dB

S₁

S₂

S₃

S₄

S₅

20

3.118

0.588

0.510

0.811

1.047

30

3.211

0.504

0.442

0.804

0.991

50

3.259

0.470

0.444

0.792

0.615

70

3.651

0.453

0.434

0.670

0.572