Plane group: p 4 g m (No. 12)

Corresponding space group: P 4 b m (No. 100)

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Surface area: green = inside the asymmetric unit, red = outside
Basis vectors: a = red, b = green, c = blue 

Number of vertices: 3
  0, 0
  0, 1/2
  1/2, 0

Number of faces: 3
  x>=0 [y<=0]
  y>=0
  x+y<=1/2
[Guide to notation] 
Geometric notation:
  x0(-y0)
  y0
  m2
[Acta Cryst. article]

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