SAXS data of FePBvFatB were collected at two sample-to-detector distances (3 m and 1 m). The 3 m setting covered the low-q region (q ≈ 0.025 to 0.126 Å-1), and the 1 m setting covered the higher-q region (q ≈ 0.126 to 0.60 Å-1). The datasets were scaled and checked for agreement in the overlap region before merging into a single profile.