Subtraction results at the position of a planet with the SGF method. Left: Overlapping simulation (ground truth) and estimation of the stellar spaxel. There is no emission line in this simulation. Middle: The green spaxel is the estimation of the planetary spaxel, while the cyan one is the associated ground truth. The self-subtraction problem is clearly visible in this situation. Right: The reason for the self-subtraction is evidenced. This is the deformation estimation, in light pink, overfitting the planetary line component of the data to stellar spectrum estimation ratio, in purple. Yet, this overfitting is relatively greater than the planetary and stellar continuum-to-line ratios are different. The real deformation is in dark pink.