[Pw_forum] about charge density

[wangqj1]

 Dear all
      When I plot the 2D charge density of ZnO (1 0 0) with pp.x,but I don't know how to set the parameter of the vectors :
e1(1) =?, e1(2)=?  e1(3) = ?,
e2(1) =?, e2(2)=?, e2(3) = ?,
  Could somebody who know it tell me the answer?
  Your advice will be appreciated .

 qianjin wang                 e-mail:  wangqj1 at 126.com
 Xiangtan university        
Xiangtan, Hunan Province, China.

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