Table 1. Factor loadings.
| Factor 1 | Factor 2 | Uniqueness | |
| Long axis length | 0.77 | 0.40 | |
| Short axis length | 0.87 | 0.26 | |
| Thickness | 0.28 | 0.20 | 0.86 |
| Depth | 1.00 | 0.00 | |
| Hardness | 0.11 | −0.16 | 0.97 |
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