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Result of symbol lookup:
  Space group number: 39
  Schoenflies symbol: C2v^15
  Hermann-Mauguin symbol: A b m 2
  Hall symbol: A 2 -2b

Input space group symbol: A b m 2
Convention: Default

Number of lattice translations: 2
Space group is acentric.
Number of representative symmetry operations: 4
Total number of symmetry operations: 8

Parallelepiped containing an asymmetric unit:
  0<=x<=1/2; 0<=y<=1/4; 0<=z<1

List of symmetry operations:
Matrix Rotation-part type Axis direction Screw/glide component Origin shift
x,y,z 1---
-x,-y,z 2[0,0,1]0,0,00,0,0
-x,y+1/2,z -2[1,0,0]0,1/2,00,0,0
x,-y+1/2,z -2[0,1,0]0,0,00,1/4,0
x,y+1/2,z+1/2 1---
-x,-y+1/2,z+1/2 2[0,0,1]0,0,1/20,1/4,0
-x,y+1,z+1/2 -2[1,0,0]0,1,1/20,0,0
x,-y+1,z+1/2 -2[0,1,0]0,0,1/20,1/2,0

List of Wyckoff positions:
Wyckoff letter Multiplicity Site symmetry
point group type
Representative special position operator
d81x,y,z
c4mx,1/4,z
b421/2,0,z
a420,0,z

Harker planes:
Algebraic Normal vector A point in the plane
2*x,2*y,0[0,0,1]0,0,0

Additional generators of Euclidean normalizer:
  Number of structure-seminvariant vectors and moduli: 2
    Vector    Modulus
    (1, 0, 0) 2
    (0, 0, 1) 0
  Inversion through a centre at: 0,0,0

Grid factors implied by symmetries:
  Space group: (1, 2, 2)
  Structure-seminvariant vectors and moduli: (2, 1, 1)
  Euclidean normalizer: (2, 2, 2)

  All points of a grid over the unit cell are mapped
  exactly onto other grid points only if the factors
  shown above are factors of the grid.


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