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Table 2
Ionic and excitation ratios for the four components in silicon and carbon, given in the form X a/ X b = log (NX a/NX b).
| A | B | C | D | |
| Ratio | log (NX a/NX b) | |||
|
|
||||
| C ii/ C iv | <−1.9 | ≥0.8 | –0.05 ± 0.1 | >0.5 |
| Si ii/ Si iv | ≤ −2 | 0.24 ± 0.03 | 0.22 ± 0.04 | – |
| C ii*/C ii | <−0.97 | ≈0 | −0.39 ± 0.03 | <0.11 |
| Si ii*/Si ii | <0 | −0.93 ± 0.04 | −1.34 ± 0.1 | – |
| O i/ O vi | <−2.75 | – | – | – |
Notes. These ratios are derived for entire systems; the values for individual components vary somewhat.
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