Table 4: Main parameters derived from the radio continuum data at 3.6 cm for an assumed distance d of 5 kpc.

Parameter Value
Flux density $S_{3.6 ~\rm cm}$ 205 $\pm$ 10 mJy
Emission measure EM $1.3\times10^4$ pc cm-6
Angular semi-axis $\sim $55 $^{\prime \prime }$
Linear radius $\sim $1.3 pc
rms electron density $n_{\rm e}$ (f = 1.0) 140
Ionized mass Mia (f = 1.0) 22.5 $M_\odot$
Filling factor f 0.05-0.15
Electron density $n_{\rm e}$ 630-360 cm-3
Ionized mass Mi b 5-9 $M_\odot$

a Including a factor of 1.27 for singly ionized He
b Including a factor of 1.27 for singly ionized He

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