Mode

Tessler and Spiridigliozzi [31]

Gautham and Ganesan [34]

Present theory

1

0.8481

0.8439

0.8327

2

1.2328

1.2317

1.1919

3

1.5902

1.5808

1.5041

4

1.9435

1.9267

1.9161