Upper panel: HARPS time series of HD 40307. For , the empty circles are the data included in M09, and have ⟨⟩ =−4.99. The filled circles are the new data presented here, with ⟨⟩ =−4.87. The vertical dashed line separates the active (BJD < 2 454 800) from the inactive data set. Lower panel: corresponding GLS periodograms for periods longer than 400 days. The vertical dotted lines represent the time span of observations and twice this value.