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Table 1 Based on stopping criteria, two components were retained in both samples (see Additional file 1, online appendix 1 for justification of stopping criteria and dimension reduction).

From: Algorithmic approaches to aid species' delimitation in multidimensional morphospace

Component Middle Eocene Upper Eocene
  Eigenvalue Cumulative Variance Explained Eigenvalue Cumulative Variance Explained
1 3.47 0.29 5.97 0.42
2 2.33 0.49 3.24 0.64
3 1.43 0.61 1.44 0.74
4 1.27 0.72 0.95 0.81
5 1.15 0.81 0.74 0.86
6 0.75 0.88 0.68 0.91
7 0.5 0.92 0.5 0.94
8 0.42 0.95 0.31 0.97
9 0.42 0.99 0.31 0.99
10 0.09 1 0.11 1