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Result of symbol lookup:
  Space group number: 87
  Schoenflies symbol: C4h^5
  Hermann-Mauguin symbol: I 4/m
  Hall symbol: -I 4

Input space group symbol: I 4/m
Convention: Default

Number of lattice translations: 2
Space group is centric.
Number of representative symmetry operations: 4
Total number of symmetry operations: 16

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

List of symmetry operations:
</pre><table border=2 cellpadding=2>
<tr>
<th>Matrix
<th>Rotation-part type
<th>Axis direction
<th>Screw/glide component
<th>Origin shift
</tr>
<tr>
<td><tt>x,y,z</tt>
<td>1<td>-<td>-<td>-
</tr>
<tr>
<td><tt>-y,x,z</tt>
<td>4^1<td>[0,0,1]<td>0,0,0<td>0,0,0
</tr>
<tr>
<td><tt>-x,-y,z</tt>
<td>2<td>[0,0,1]<td>0,0,0<td>0,0,0
</tr>
<tr>
<td><tt>y,-x,z</tt>
<td>4^-1<td>[0,0,1]<td>0,0,0<td>0,0,0
</tr>
<tr>
<td><tt>-x,-y,-z</tt>
<td>-1<td>-<td>-<td>0,0,0
</tr>
<tr>
<td><tt>y,-x,-z</tt>
<td>-4^1<td>[0,0,1]<td>0,0,0<td>0,0,0
</tr>
<tr>
<td><tt>x,y,-z</tt>
<td>-2<td>[0,0,1]<td>0,0,0<td>0,0,0
</tr>
<tr>
<td><tt>-y,x,-z</tt>
<td>-4^-1<td>[0,0,1]<td>0,0,0<td>0,0,0
</tr>
<tr>
<td><tt>x+1/2,y+1/2,z+1/2</tt>
<td>1<td>-<td>-<td>-
</tr>
<tr>
<td><tt>-y+1/2,x+1/2,z+1/2</tt>
<td>4^1<td>[0,0,1]<td>0,0,1/2<td>0,1/2,0
</tr>
<tr>
<td><tt>-x+1/2,-y+1/2,z+1/2</tt>
<td>2<td>[0,0,1]<td>0,0,1/2<td>1/4,1/4,0
</tr>
<tr>
<td><tt>y+1/2,-x+1/2,z+1/2</tt>
<td>4^-1<td>[0,0,1]<td>0,0,1/2<td>1/2,0,0
</tr>
<tr>
<td><tt>-x+1/2,-y+1/2,-z+1/2</tt>
<td>-1<td>-<td>-<td>1/4,1/4,1/4
</tr>
<tr>
<td><tt>y+1/2,-x+1/2,-z+1/2</tt>
<td>-4^1<td>[0,0,1]<td>0,0,0<td>1/2,0,1/4
</tr>
<tr>
<td><tt>x+1/2,y+1/2,-z+1/2</tt>
<td>-2<td>[0,0,1]<td>1/2,1/2,0<td>0,0,1/4
</tr>
<tr>
<td><tt>-y+1/2,x+1/2,-z+1/2</tt>
<td>-4^-1<td>[0,0,1]<td>0,0,0<td>0,1/2,1/4
</tr>
</table><pre>

List of Wyckoff positions:
</pre><table border=2 cellpadding=2>
<tr>
<th>Wyckoff letter
<th>Multiplicity
<th>Site symmetry<br>point group type
<th>Representative special position operator
</tr>
<tr>
<td>i<td>16<td>1<td><tt>x,y,z</tt>
</tr>
<tr>
<td>h<td>8<td>m<td><tt>x,y,0</tt>
</tr>
<tr>
<td>g<td>8<td>2<td><tt>0,1/2,z</tt>
</tr>
<tr>
<td>f<td>8<td>-1<td><tt>1/4,1/4,1/4</tt>
</tr>
<tr>
<td>e<td>4<td>4<td><tt>0,0,z</tt>
</tr>
<tr>
<td>d<td>4<td>-4<td><tt>0,1/2,1/4</tt>
</tr>
<tr>
<td>c<td>4<td>2/m<td><tt>0,1/2,0</tt>
</tr>
<tr>
<td>b<td>2<td>4/m<td><tt>0,0,1/2</tt>
</tr>
<tr>
<td>a<td>2<td>4/m<td><tt>0,0,0</tt>
</tr>
</table><pre>

Harker planes:
</pre><table border=2 cellpadding=2>
<tr>
<th>Algebraic
<th>Normal vector
<th>A point in the plane
</tr>
<tr>
<td><tt>x-y,-x-y,0</tt><td>[0,0,1]<td>0,0,0
</tr>
</table><pre>

Additional generators of Euclidean normalizer:
  Number of structure-seminvariant vectors and moduli: 1
    Vector    Modulus
    (0, 0, 1) 2
  Further generators:
</pre><table border=2 cellpadding=2>
<tr>
<th>Matrix
<th>Rotation-part type
<th>Axis direction
<th>Screw/glide component
<th>Origin shift
</tr>
<tr>
<td><tt>y,x,z</tt>
<td>-2<td>[-1,1,0]<td>0,0,0<td>0,0,0
</tr>
</table><pre>

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

</pre>
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