Envelope of the different LSP realisations after correction at ±ìcr (brown) and ± 2σ (green). We show the upper envelope (solid line) and lower envelope (dashed line) for the F6, G2, and K4 spectral types (from top to bottom). The average power is plotted in pink. The typical power due to a 1 M_Earth planet alone (without activity) in the habitable zone (delimited by the two vertical lines) is shown in purple. The filled rectangle corresponds to the ± 1σ levels, and the dashed lines indicate the full extent of possible values for the planet signal.