Effect of N_obs on performance studied in Sects. 2, 3, and 4 for G2 stars, PHZ_med and ALL_{GRAhigh,SGlow}. The different panels represent: fp_M from Sect. 2.3; detection rates using the true false positive level in power (black line) and mass (red line) from Sect. 3.1; true detection limits in power (black line for 50% detection rate, red line for 95% detection rate) and in mass (green line for 50% detection rate, blue line for 95% detection rate) from Sect. 3.2; fap/fp_P from Sect. 4.1; average LPA detection limit from Sect. 4.2; 1σ uncertainty on the mass characterisation from Sect. 4.3 (black for 1 M_Earth and red for 2 M_Earth); detection rate from the blind test in Sect. 4.4 with planet injected (green) and good recovery when no planet is injected (black); false positives when a planet is injected (dashed black line) and no planet is injected (red) from the same blind tests. The dotted lines correspond to what would be obtained if the variability was following a law ( in the case of the detection rate), scaled to the values at 180 days.