空间群F D -3 M Z是什么意思啊？与F D 3 M 的区别是什么啊？
希望能讲的详细一点，谢谢虫子们！
然后附上一段英文说明，请问我该如何改写？
Specifies symmetry information by space group. Either the standard symbol may be used or the extended symbol for specifying alternative settings. When giving extended symbols only the first line in International Tables should be given . i.e. the 4th operator/qualifier after the centring symbol should be omitted. For example, in order specify the non-standard P 21/A setting of P 21/C the input should be 1 21/A 1
其中 the extended symbol可以理解为非标准的群
1 21/A 1
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