Plane group: p 2 m g (No. 7)

Corresponding space group: P m a 2 (No. 28)

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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
  1/4, 0
  1/4, 1
Number of faces: 4
  x>=0 [y<=1/2]
  x<=1/4
  y>=0
  y<1
[Guide to notation]
Geometric notation:
  x0(y2)
  x4
  y0
  +y1
[Acta Cryst. article]


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