Example of background subtraction and companion/ghost filtration. Top left: I_left image of flux frame taken before all Polarimetrie cycles in K-hop. Top middle: I_left with the background subtracted. Top right: I_left with the background subtracted and with the ghost filtered. Bottom left: I_tot of the first cycle from the Κ sequence. Bottom middle: I_tot with the background subtracted. Bottom right: I_tot with the background subtracted and the companion filtered.