Plane group: c m (No. 5)

Corresponding space group: C m 1 1 (No. 8)

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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<1/2
[Guide to notation] 
Geometric notation:
  x0
  x2
  y0
  +y2
[Acta Cryst. article]

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