How to interpret Selected Area Electron Diffraction (SAED) graphs and HR-TEM/SAED graphs in your research paper or thesis? SAED gives information whether your material is mono-crystalline, poly- crystalline or amorphous. It gives the following information about the materials (Nanostructured Materials) i. TEM is basically a nano size characterization tool. ii. Shape and particle size (morphology, crystallite size, grain size, particle size, lattice information, plane indices, dislocations, and diffraction patterns) iii. Grain boundaries