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Fig. 4

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Rms of the binned RVs, rmsRVb, as a function of the binning in days. The different considered strategies are one measurement per night (the 2 heavy continuous lines), 2 measurements per night with a spacing of 5 h (the 2 dashed lines) and 3 measurements per night with a spacing of 2 h (the 2 thin continuous lines). Circles represent a total observing time of 15 min per night (1  ×  15 min), squares represent a total observing time of 30 min per night (1  ×  30 min, 2  ×  15 min, and 3  ×  10 min) and triangles represent a total observing time of 1 h per night (2  ×  30 min and 3  ×  20 min).

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