Mie scattering vs. HFSS

I have obtained the normalized bistatic cross section [Q = sigma/ (pi a^2)] in the problem of scattering of a plane wave by a sphere made of a material with epsilon_r = 4, using HFSS and using Mie scattering method. In HFSS, I have chosen the radius 'a' of the sphere and the frequency 'f' of the simulation such that k_0 a = 3, where k_0 is the wavenumber.

I have made a comparison and found a discrepancy between the two results. I have attached my results.

Can anyone help, please?


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