Example of the periodogram for OGS alone (upper panel, GRAhigh alone) and with a planet at LPA mass (0.53 M_Earth, lower panel) to illustrate the LPA computations. The red and green horizontal lines correspond to the maximum of the OGS periodogram in the window delimited by the dotted lines and multiplied by 1.3 respectively. The green solid line periodogram in the upper panel is for the planet alone. The example of periodogram with OGS + planet is for an arbitrary phase of the planet, and the horizontal orange line corresponds to the maximum power. Orange stars are for 100 realisations of the planet phase.