| Ion | Ioniz. | Lines | Observed |
 |
| Pot. (eV) | used | ratio | (cm-3) | |
| [S II] | 10.4 | 6731/6716 | 1.51 | 2300 |
| 13.6 | 3626/3729 | 1.62 | 2800 | |
| 23.3 | 33.5/18.7 | 0.409 | 2900 | |
| 23.8 | 5538/5518 | 1.3: | 3000: | |
| 35.1 | 51.8/88.4 | 2.1 | 800: | |
| 40.7 | 4711/4740 | 0.87 | 4000: |
| : Indicates uncertain values. Wavelength units as in Table 7. |