Upper panel: correlation between HARPS bisector span and RVs obtained from the three different pipelines. Lower panels: timeseries of the RV residuals after removing the correlation from HARPS RVs (same colour-coding as for the pipelines). The solid lines represent the RV signal in the case of a planet with the same orbital elements as DS Tuc A b and a semi-amplitude corresponding to the mass upper limit estimated from the residuals (green line) and from empirical relation (blue line).
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