Plane group: p 2 g g (No. 8)

Corresponding space group: P b a 2 (No. 32)

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

Number of vertices: 4
  0, 0
  0, 1/2
  1/2, 0
  1/2, 1/2
Number of faces: 4
  x>=0
  x<=1/2 [y<=0]
  y>=0
  y<1/2
[Guide to notation]
Geometric notation:
  x0
  x2(-y0)
  y0
  +y2
[Acta Cryst. article]


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