Top: LDF at 393.37, 535.7, 607.1, 782.2 and 1025.0 nm, for the HM98 (empirical power-law model extrapolated to the limb), COSI models and 3D model. Their convolution with the nominal PSF of SODISM II is dominated by diffraction. Middle: SODISM II PSF for each wavelength. These PSF have been estimated by an optical model of SODISM II. Bottom: first derivative of the convolution between the two observables (LDF and PSF). It can be verified visually that the FWHM of the first derivative of the solar limb is about two arcsec.
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