An overview of the previously known information about the topology of the L-shaped DS streaks in NBT. (a) 0kl section of reciprocal space reconstructed from the data collected using a home-laboratory Gemini R diffractometer. (b) A schematic diagram showing the topology of the diffuse scattering streaks (blue) in relation to the Bragg scattering (black). (c) An enlarged three-dimensional schematic view of a smaller reciprocal space volume. The streaks extend along one of the reciprocal lattice directions.