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Wavelength dependence of the average total scattering cross-section calculated from the TEM. Multiplication of 〈ρσt (λ)〉 by (λ/550)3 removes the wavelength dependence of the average single fibril scattering cross-section. In agreement with the experimental data in Figure 3, plots of the calculated values of (λ/550)3 〈ρσt (λ)〉 are also straight lines whose slopes progressively increase from Group 1 to 3.
