Bilbao Crystallographic Server Standard/Default settings

Standard (default) Choices for the Space Group Settings

• unique axis b (cell choice 1) for space groups within the monoclinic system.
• obverse triple hexagonal unit cell for R space groups.
• the origin choice two - inversion center at (0,0,0) - for the centrosymmetric space groups for which there are two origin choices, within the orthorhombic, tetragonal and cubic systems.