... Raouafi

Associated researcher to the LERMA Department at the Observatoire de Paris-Meudon, France.

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... density

The measured electron density in the polar holes is given by Wilhelm et al. (1998) and is $\sim$ $7\times 10^6$ cm^-3. However, when one uses this value the depolarization of the scattered line is very important, so that the degree of linear polarization is considerably smaller than what is measured.

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