Table 1: Journal of our spectroscopic observations of WR 20a. The first and second columns provide the heliocentric Julian date (in the format HJD - 2 450 000) and the orbital phase assuming a period of 3.675 days and adopting phase $\phi = 0.0$ as given in Table 2. The third column indicates whether the blue (B) or violet (V) spectral range was observed. The recentred and averaged primary and secondary radial velocities are given in Cols. 4 and 5 respectively (see text). Finally, the last column yields the weight that we assigned to the various RV data in the orbital solution.
Date $\phi$ Set-up RV1 RV2 Weight
      (km s-1) (km s-1)  
2354.560 0.542 B -11.7 -11.7 0.1
2355.600 0.825 V 290.7 -319.3 0.7
3032.716 0.074 B -131.9 182.9 0.2
3032.742 0.081 V 9.1 9.1 0.1
3033.715 0.346 V -288.4 277.4 0.7
3033.739 0.353 B -285.1 292.6 1.0
3034.715 0.618 V 235.8 -219.1 0.7
3034.741 0.625 B 287.6 -265.5 1.0
3035.719 0.892 V 269.3 -222.7 0.7
3035.746 0.899 B 245.2 -219.4 1.0
3036.719 0.164 V -259.7 287.0 0.7
3036.743 0.170 B -302.6 309.5 1.0
3037.738 0.441 V -78.3 -78.3 0.1
3037.762 0.447 B -74.0 -74.0 0.1
3038.723 0.709 V 363.5 -354.0 0.7
3038.746 0.715 B 374.6 -375.9 1.0
3039.718 0.980 V 12.4 12.4 0.1
3039.752 0.989 B -28.0 -28.0 0.1
3040.717 0.252 V -309.3 368.4 0.7
3040.741 0.258 B -336.1 394.0 1.0
3041.722 0.525 V 4.3 4.3 0.1
3041.747 0.532 B 22.9 22.9 0.1
3042.714 0.795 B 375.4 -374.4 0.2


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