Correction to ``Electron density estimations derived from spacecraft potential measurements on Cluster in tenuous plasma regions''

Sauvaud, J. -A.; Dandouras, I.; André, M.; Eriksson, A.; Fazakerley, A.; Masson, A.; Paschmann, G.; Lybekk, B.; Pedersen, A.; Svenes, K.; Lindqvist, P. -A.; Torkar, K.; Mozer, F.; DéCréAu, P. M. E.; Taylor, M.; Whipple, E.