Evolution of the S/N (blue) for various priors for HD 206893b (2017-07-13, IFS, YJ band). The x-axis gives the index of the priors. The S/N corresponding to the 10 last priors are below the 5σ detection threshold. Priors are ordered by decreasing S/N for clarity purposes. The S/N reached for spectral prior close to the spectrum (in contrast) leads to a detection with a significance above the 5σ detection threshold.