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Table 4
Observed electron density indicators in the nebulae.
| Ion | Ioniz. | Lines | Obs. Ratio | Ne (cm-3) | Obs. Ratio | Ne (cm-3) | Obs. Ratio | Ne (cm-3) | Obs. Ratio | Ne (cm-3) |
| Pot.(eV) | Used | NGC 1535 | NGC 1535 | Tc1 | Tc1 | He2-108 | He2-108 | NGC 6629 | NGC 6629 | |
|
|
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| [S ii] | 10.4 | 6731/6716 | 1.8: | 2500: | 1.59 | 2900: | 0.74 | 1600 | ||
| [O ii] | 13.6 | 3726/3729 | 1.8: | 3000: | 1.51 | 1900: | 1.63 | 2400 | ||
| [S iii] | 23.3 | 33.5/18.7 | 0.94 | 700 | 0.444 | 3200 | 0.485 | 2200 | 0.525 | 2200 |
| [Cl iii] | 23.8 | 5538/5518 | 0.70: | 600: | 1.06 | 3000: | 0.9: | 1400: | ||
| [C iii] | 24.4 | 1906/1909 | 1.48 | 900 | 1.24 | 4500 | ||||
| [Ar iv] | 40.7 | 4740/4711 | 0.76: | 1000: | ||||||
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