Plane group: p 3 1 m (No. 15)

Corresponding space group: P 3 1 m (No. 157)

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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
  1/2, 0
  1/2, 1/2
  2/3, 1/3

Number of faces: 4
  y>=0
  2*x-y<=1
  x+y<=1 [y<=1/3]
  x-y>=0
[Guide to notation] 
Geometric notation:
  y0
  k1
  m1(y3)
  p0
[Acta Cryst. article]

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