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(a) SAXS spectrum from a 3% DNA solution containing an aqueous solution of 100 mM NaCl and 80 mM SrCl2. The fit is Eq. 6, with χ = 4.3 cm−1, r1 = 10.0 Å, r2 = 13.8 Å, h = 0.40, and L = 200 Å; (b) SAXS spectrum from a 3% DNA solution containing an aqueous solution of 100 mM NaCl and 30 mM SrCl2. The parameters to the fit of Eq. 6 are I(0) = 2.4 cm−1, r1 = 10.0 Å, r2 = 13.8 Å, h = 0.265, and L = 90 Å.
