Plane group: p 3 (No. 13)

Corresponding space group: P 3 (No. 143)

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

Number of vertices: 5
  0, 0
  0, 1/2
  1/3, 2/3
  1/2, 0
  2/3, 1/3

Number of faces: 5
  x>=0 [y<=0]
  y>=0
  2*x-y<=1
  x+y<=1 [-x+2*y>=1 | 2*x-y>=1]
  -x+2*y<=1
[Guide to notation] 
Geometric notation:
  x0(-y0)
  y0
  k1
  m1(-h1 | -k1)
  h1
[Acta Cryst. article]

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