Defect contrast with 4D-STEM: Understanding crystalline order with virtual detectors and beam modification

4D-STEM datasets from Ribet, S.M., Ophus, C., Reis, R.D. and Dravid, V.P "Defect contrast with 4D-STEM: Applications of virtual detectors and beam modification." (2022). The files here are: 1. PbTiO3 with a 2 mrad convergence angle 2. graphene with an 8, 14, and 20 mrad convergence angle本四维扫描透射电子显微镜（4D-STEM）数据集源自Ribet, S.M.、Ophus, C.、Reis, R.D.与Dravid, V.P.于2022年发表的研究论文《4D-STEM下的缺陷衬度：虚拟探测器与束流修饰的应用》（原英文标题：Defect contrast with 4D-STEM: Applications of virtual detectors and beam modification）。 本次提供的数据集文件包含以下两类样品： 1. 收敛角为2毫弧度（mrad）的钛酸铅（PbTiO₃）样品 2. 收敛角分别为8、14及20毫弧度的石墨烯样品