Time evolution of SEDs for a 10⁹ M_⊙ system normalized to the distance of 10 pc for the SAL IMF slope α = 2.35 within the mass range (1, 100) M_⊙ and metallicity Z = 0.001. We compare computed PEGASE models and downloaded SB99 models with the same parameters. The SEDs are normalized to the distance of 10 pc. The stellar mass range used here has been adopted only for this comparison for computational ease.