Fig. 1
Highest RV shift between individual spectra plotted against time difference between the corresponding observing epochs for the O(He) star J0757 (red triangle), the PG1159 star J1556 (black inverted triangle), and the three O(H) stars J1000, J2046, and J0935 (blue filled circles). The numbers in the brackets correspond to the number of epochs each star was observed. Note that the RV shifts of J2046 were found to be not significant.
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