MRS PSF FWHM compared to the diffraction-limited prediction. Top: MRS PSF FWHM determined on the detector image plane for each of the 12 MRS spectral bands (colored curves) as well as in the reconstructed 3D drizzled cubes (black dashed line). The theoretical diffraction limit is shown by the diagonal dashed red line. Bottom: Ratio of computed FWHM on the detector plane (colored curves) and the reconstructed 3D drizzled cubes (black dashed lines), and a diffraction-limited FWHM.