[Wannier] A question on example15

[庞瑞(PANG Rui)]

Dear all
I found in the exampel15, the projection part was write in a very complex way. Could someone tell me why it was written like that?  How were those values decided?
Thanks.
 




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庞瑞(PANG Rui)



South University of Science and Technology of China/Department of Physics

No.1088,Xueyuan Road, Shenzhen,Guangdong
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