| Group | PC1 Mean | a | b |
| C | −3.79521 | **** | |
| SA25 | 0.65955 | **** | |
| RA50 | 0.71558 | **** | |
| RA10 | 1.07581 | **** | |
| SA5 | 1.15881 | **** | |
| DM2 | 1.39560 | **** |
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