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Abstract We present the crystallographic program J ana 2020, the successor of J ana 2006. J ana 2020 has new, technically different graphics and structure plot-driven intuitive control. Tools known from J ana 2006 were revised and inserted into a new logical scheme, and their control connected with the structure plot. Some of the tools were considerably improved. We focus on the details of the most dynamically developing parts, namely twinned structures, magnetic structures, and structure analysis based on electron diffraction data.
Petřı́ček et al. (Wed,) studied this question.