Pr | Ramachandran et al. (1988) | Lok et al. (2005) | Ishak et al. (2008) | Olanrewaju et al. (2011) | Present study |
0.7 | 1.7063 | 1.706376 | 1.7063 | 1.7063227120375 | 1.706322 |
1 | - | - | 1.6755 | 1.6754365718388 | 1.675436 |
7 | 1.5179 | 1.517952 | 1.5179 | 1.5179126193762 | 1.517912 |
10 | - | - | 1.4928 | 1.4928386730384 | 1.492838 |