Contrast of the detections as a function of their distance to the star TYC-8979-1683-1. The theoretical contrasts and distances of the 20 injected synthetic planets are shown as vertical and horizontal lines: we should have found a planetary signal at every crossing. One synthetic companion has also been added at the closest separation just above the detection limit in order to check its consistency (red dashed line). The detection limit at 5σ is overplotted (solid line). This detection limit curve is corrected for the underestimation of the small sample statistics at close separation from the star (see Sect. 2.4). The minimum value of the flux standard deviation map at 5σ for each separation is overplotted for information (dotted line). The radial median of the flux standard deviation map at 5σ, however, provides a realistic estimation of the detection limit. The detected signals assessed to be tertiary lobes are not shown on the graph.