Plane group: c 2 m m (No. 9)

Corresponding space group: C m m 2 (No. 35)

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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
  1/4, 0
  1/4, 1/2
Number of faces: 4
  x>=0
  x<=1/4 [y<=1/4]
  y>=0
  y<=1/2
[Guide to notation]
Geometric notation:
  x0
  x4(y4)
  y0
  y2
[Acta Cryst. article]


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