Time-series and GLS periodograms for activity diagnostics derived from HARPS spectra. Rows 1–4: time series (left panels) and periodograms (right panels) of the CCF FWHM, and activity indexes derived from the spectral lines CaII H&K, Hα and NaI. For the FWHM, we show the periodogram of the residuals, after removing the long-term trend clearly seen in the time series. The levels of FAPs are indicated as horizontal dashed lines (green: FAP 0.1%; yellow: 1%; red: 10%), and are determined through a bootstrap analysis. Last row: Window function of the data.