Aset of best recombined images as found by K-Stacker, for different reoptimized S/N values, and for cases where the algorithm found a true/false planet candidate. In each panel, the blue arrow shows the position of the planet candidate found by K-Stacker. Panel a (resp. panel b): S∕N = 5.7 with a correct (resp. false) planet candidate. Panel c (resp. panel d): S∕N = 6.0 with a correct (resp. false) planet candidate. Panel e (resp. panel f): S∕N = 6.5 with a correct (resp. false) planet candidate. Panel g: S∕N = 8.3, with a true planet candidate. We note that the observer has been able to correctly identify a false positive (S∕N > 6) without planets injected in simulations: panel b, d, and e using the shape of the spot, without any a priori information on the planet injection.