Results from the deconvolution of a simulated spectrogram of the CALSPEC star HD111980 with a Moffat PSF kernel, without second-order diffraction contamination, (γ₀,γ₁,γ₂) = (10,2,5) and (α₀, α₁, α₂) = (2, 0, 0). Left: simulated spectrogram (top), best-,fitting spectrogram model (middle) and residuals in units of σ (bottom) after the rotation process and the 1D transverse fit. Right: same simulated spectrogram with its original rotation (top), best-fitting spectrogram model (middle), and residuals in units of σ (bottom) after the deconvolution process. All colour maps are normalised by the maximum of the simulated spectrogram. The grey areas designate masked pixels.