Derivation of the static product used in the fourth flux correction performed by YARARA dedicated to ghosts contamination. Left: master raw image of the blue detector obtained after stacking two months of FLAT calibration frames when only the science fibre was illuminated. The echelle spectrograph orders are the vertical parabola, which are masked here to highlight the ghosts visible in the background. Middle: ghosts as fitted by our models. Right: map of ghost contamination indicating the location of the ghost of the science fibre on itself. Bright colour highlights the intersection of the ghosts with the physical orders. A similar map was derived for the ghosts of the simultaneous calibration fibre crossing the order of the science fibre.