Plane group: p 2 (No. 2)

Corresponding space group: P 1 1 2 (No. 3)

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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
  1/2, 0
  1/2, 1

Number of faces: 4
  x>=0 [y<=1/2]
  x<=1/2 [y<=1/2]
  y>=0
  y<1
[Guide to notation] 
Geometric notation:
  x0(y2)
  x2(y2)
  y0
  +y1
[Acta Cryst. article]

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