A, SAXS/WAXS three-dimensional surfaces of the ABC transport proteins. B, comparison of the calculated scattering curves of the SAXS/WAXS surfaces (solid black lines) and the raw data (dotted line for RPA0668, solid line for RPA0985, dashed for RPA4029, and dashed-dotted for RPA1789). RPA0668 χ2 = 3.7 (R2 = 0.9996), RPA0985 χ2 = 2.4 (R2 = 0.9998), RPA4029 χ2 = 1.7 (R2 = 0.9998), and RPA1789 χ2 = 1.1 (R2 = 0.9996).