Plane group: p 6 m m (No. 17)

Corresponding space group: P 6 m m (No. 183)

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

Number of faces: 3
  y>=0
  2*x-y<=1
  x-2*y>=0
[Guide to notation] 
Geometric notation:
  y0
  k1
  -h0
[Acta Cryst. article]

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