| Combined error (mm) | Coefficient of reliability |
U1 (x) | 0.19 | 0.885 |
U1 (y) | 0.16 | 0.985 |
U2 (x) | 0.17 | 0.994 |
U2 (y) | 0.15 | 0.983 |
U3 (x) | 0.13 | 0.998 |
U3 (y) | 0.18 | 0.973 |
U3 (z) | 0.17 | 0.998 |
APW | 0.17 | 0.989 |
APL | 0.20 | 0.971 |