Calculation about Chern number

[wlliu]

Dear Sir,

My name is Wenliang Liu. I come from Xiangtan University, Xiangtan，Hunan Provience, China.

I'm writing to enquire about  how I set these two parameters( isym and sym_eig) in the  file seedname.pw2z2.in. 

Thanks a  lot and forward to hearing from you soon.

Best Regards,
Wenliang Liu
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