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Table 3

Electron density of filled regions.

Source L Emission measure ne ne   spec.
number [pc] [pc cm-6] [cm-3] [cm-3]

23 175 970 2.4 <20
35 220 83 0.6
59 160 42 0.5
77 180 222 1.1 <10
47 180 411 1.5
102 175 156 0.9 <10
57 170 222 1.1
34 185 100 0.7
5 190 211 1.1 <10

Notes.Electron density upper limits in the last column (ne  spec.) are from spectroscopic data (Magrini et al. 2007).

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