We thank our referee Brian Wood for his valuable comments, his help for the rewording of the paper and the improvements he suggested. This work has been done in the frame of the INTAS project "The heliosphere in the Local Interstellar Cloud" and partly supported by the ISSI in Bern. V.I. has been supported by the MENESR (France). Yu.M. has been supported by RFBR Grants No.98-01-00955,98-02-16759.
© European Southern Observatory (ESO) 1999
Online publication: December 22, 1998