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Hint

I(0) is proportional to dSLD2V2,

where ΔSLD = SLDparticle - SLDsolvent is the contrast (or, excess scattering length density) and V is the particle volume.

try, e.g. to simulate a sphere with ΔSLD of 0.1 as Model 1 and a sphere with ΔSLD 10 as Model 2.