SAXS measurements were carried out at BL-10C at the Photon Factory of the High Energy Accelerator Research Organization (KEK) in Tsukuba, Japan (32). Solutions were loaded into cells (stainless steel surround, 20-μm-thick quartz glass windows, 1.25-mm path length), and the temperature was maintained at around 293 K (room temperature). An x-ray wavelength of 1.5 Å and a sample-detector distance of 1029 mm (calibrated using silver behenate) gave a detectable Q range of the order of 0.1 to 5.9 nm−1. Sixty frames were collected with an exposure time of 10 s: Radiation damage was not observed, so these data were averaged to give a total integration time of 600 s. The 2D scattering data (detector: DECTRIS PILATUS3 2M) were radially averaged to yield 1D scattering intensity data [I(Q) versus Q]. This was normalized using water as a reference, and the solvent + cell background was subtracted, to give absolute scattering intensity I(Q) in cm−1. All data reduction was carried out using the software package SAngler (33).

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