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Table 2
Electron density of clear shells.
| Source | L | Emission measure | ne const. | ne max. | ne spec. |
| number | [pc] | [pc cm-6] | [cm-3] | [cm-3] | [cm-3] |
|
|
|||||
| 87 | 120 | 13 | 0.3 | 0.4 | – |
| 48 | 110 | 40 | 0.6 | 0.8 | – |
| 32 | 105 | 26 | 0.5 | 0.7 | <30 |
| 66 | 100 | 50 | 0.7 | 1.0 | – |
| 116 | 85 | 14 | 0.4 | 0.6 | – |
Notes.The constant electron density, ne const, as well as the maximum of the Cauchy-Lorentz distribution of the electron density, nemax, are shown in Cols. 4 and 5, respectively. Electron density upper limits in the last column (ne spec.) are from spectroscopic data (Magrini et al. 2007).
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