We are grateful to the referees, Dr H.A. Abt and Mr D.W. Willmarth, for their valuable remarks which helped to improve the language of the paper. We thank Dr S. Udry for the reduction of the SB2 correlation dips. This work was facilited by the use of the CDS bibliography. The work of YD and JCM has been supported by continuous grants from the Swiss National Foundation for Scientific Research (FNRS).
© European Southern Observatory (ESO) 2000
Online publication: February 25, 2000