Table B.1: Radial velocity of the main He and N lines for both stars measured on OHP spectra (expressed in km s-1). The mean radial velocity along with its 1-$\sigma $ standard deviations are provided for each observing run. All individual RVs can be found in the WEBDA data base at http://obswww.unige.ch/webda.
  HD 15570
Data set He I He II N III N III
  $\lambda $ 4471 $\lambda $ 4542 $\lambda $ 4634 $\lambda $ 4641

Sep. 2000		 -69.1 $\pm$ 8.2 -46.7 $\pm$ 8.7 -56.1 $\pm$ 3.9 -67.0 $\pm$ 2.8
Sep. 2001 -65.1 $\pm$ 10.6 -51.1 $\pm$ 3.2 -58.6 $\pm$ 3.5 -70.3 $\pm$ 2.0
Sep. 2002 -60.5 $\pm$ 13.2 -50.0 $\pm$ 5.0 -56.8 $\pm$ 4.6 -70.0 $\pm$ 3.3
Oct. 2003 -59.3 $\pm$ 15.7 -46.2 $\pm$ 3.9 -55.6 $\pm$ 4.5 -67.6 $\pm$ 5.4
Oct. 2004 -72.7 $\pm$ 8.3 -47.8 $\pm$ 7.0 -58.0 $\pm$ 4.7 -70.6 $\pm$ 3.7
All -65.0 $\pm$ 12.3 -48.3 $\pm$ 5.9 -56.9 $\pm$ 4.2 -69.1 $\pm$ 3.8
  HD 15629
Data set He I He II N III N III
  $\lambda $ 4471 $\lambda $ 4542 $\lambda $ 4634 $\lambda $ 4641
Sep. 2000 - - - -
Sep. 2001 - - - -
Sep. 2002 -60.6 $\pm$ 3.6 -46.9 $\pm$ 4.5 -59.9 $\pm$ 8.8 -72.1 $\pm$ 6.8
Oct. 2003 -55.3 $\pm$ 4.6 -41.0 $\pm$ 1.6 -54.6 $\pm$ 3.2 -71.6 $\pm$ 2.6
Oct. 2004 -58.2 $\pm$ 5.9 -50.1 $\pm$ 4.6 -63.5 $\pm$ 8.3 -74.6 $\pm$ 6.5
All -58.7 $\pm$ 4.9 -46.8 $\pm$ 5.2 -60.1 $\pm$ 8.2 -72.9 $\pm$ 6.0

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