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Table B.1.
Best-fit coefficients for the PA relation and its boundaries in the form given in Eq. B.1.
| Sp. type | relation | a0 | a1 | a2 |
|---|---|---|---|---|
| O-rich | center | 10.78 | -2.660 | 0.5953 |
| lower edge | 10.46 | -2.818 | 0.6578 | |
| upper edge | 10.54 | -0.8187 | -0.2335 | |
| C-rich | center | 9.755 | -0.7532 | |
| lower edge | 9.982 | -1.698 | ||
| upper edge | 8.498 | -1.827 | -0.9959 | |
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