| Thickness | N | L1 | L2 | a1 | a2 | b1 | b2 |
| 0.5 mm | 20 | 76.06 ± 0.49 | 75.23 ± 0.03 | −1.23 ± 0.03 | −0.93 ± 0.01 | 22.04 ± 0.14 | 22.29 ± 0.01 |
| 1 mm | 20 | 75.25 ± 0.20 | 74.63 ± 0.02 | −0.59 ± 0.05 | −0.38 ± 0.01 | 21.06 ± 0.13 | 21.20 ± 0.02 |
| 1.5 mm | 20 | 74.04 ± 0.19 | 73.58 ± 0.18 | 0.14 ± 0.02 | 0.32 ± 0.01 | 20.52 ± 0.25 | 20.65 ± 0.01 |
| 2 mm | 20 | 73.21 ± 0.10 | 72.83 ± 0.01 | 0.62 ± 0.02 | 0.78 ± 0.02 | 20.28 ± 0.35 | 20.40 ± 0.02 |