```6.2.1.1.  SELECTING BRAVAIS LATTICES

Option [K] selected from the lattice option menu L, see Sec. 6.2.1, allows
you to define any of the 14 primitive Bravais lattices. This lattice can be
updated later to include a lattice basis for the most general definition of a

========== LATTICE OPTIONS ===============================================
Select from Bravais lattices :

[A] triclinic-P    [B] monoclinic-P   [C] monoclinic-B
[D] rhombic-P      [E] rhombic-C      [F] rhombic-I      [G] rhombic-F
[H] tetragonal-P   [I] tetragonal-I   [J] hexagonal-P    [K] trigonal-R
[L] cubic-P        [M] cubic-I        [N] cubic-F        [?,]esc
==================================================================== 79 ==

>   [A]  selected from submenu LK confirms a primitive triclinic lattice,
see Sec. 5.3, and prompts for three lattice constants, a, b, c, by

triclinic-P  lattice selected,  code = 10
Basic lattice constants A,B,C :

and for three angles, <(R2,R3), <(R1,R3), <(R1,R2), by

Angles <(R2,R3), <(R1,R3), <(R1,R2) :

which concludes the lattice definition.

>   [B]  selected from submenu LK confirms a primitive monoclinic lattice,
see Sec. 5.3, and prompts for three lattice constants, a, b, c, by

monoclinic-P  lattice selected,  code = 10
Basic lattice constants A,B,C :

and for three angles, <(R2,R3), <(R1,R3), <(R1,R2), with constraints

Angles  <(R2,R3), <(R1,R3), <(R1,R2)
( alp,90,90 / 90,bet,90 / 90,90,gam ):

where in all three cases, see Sec. 5.3, two of the angles must
equal 90 degrees, which concludes the lattice definition.

>   [C]  selected from submenu LK confirms a side centered monoclinic
lattice, see Sec. 5.3, and prompts for three lattice constants,
a, b, c, by

monoclinic-C  lattice selected,  code = 10
Basic lattice constants A,B,C :

and for three angles, <(R2,R3), <(R1,R3), <(R1,R2), with constraints

Angles  <(R2,R3), <(R1,R3), <(R1,R2)
( alp,90,90 / 90,bet,90 / 90,90,gam ):

where in all three cases, see Sec. 5.3, two of the angles must
equal 90 degrees, which concludes the lattice definition.

>   [D]  selected from submenu LK confirms a primitive orthorhombic lattice,
see Sec. 5.3, and prompts for three lattice constants, a, b, c, by

orthorhombic-P  lattice selected,  code = 10
Basic lattice constants A,B,C :

which concludes the lattice definition.

>   [E]  selected from submenu LK confirms a side centered orthorhombic
lattice, see Sec. 5.3, and prompts for three lattice constants,
a, b, c, by

orthorhombic-C  lattice selected,  code = 10
Basic lattice constants A,B,C :

which concludes the lattice definition.

>   [F]  selected from submenu LK confirms a body centered orthorhombic
lattice, see Sec. 5.3, and prompts for three lattice constants,
a, b, c, by

orthorhombic-I  lattice selected,  code = 10
Basic lattice constants A,B,C :

which concludes the lattice definition.

>   [G]  selected from submenu LK confirms a face centered orthorhombic
lattice, see Sec. 5.3, and prompts for three lattice constants,
a, b, c, by

orthorhombic-F  lattice selected,  code = 10
Basic lattice constants A,B,C :

which concludes the lattice definition.

>   [H]  selected from submenu LK confirms a primitive tetragonal lattice,
see Sec. 5.3, and prompts for two lattice constants, a, c, by

tetragonal-P  lattice selected,  code = 10
Basic lattice constants A,C :

which concludes the lattice definition.

>   [I]  selected from submenu LK confirms a body centered tetragonal
lattice, see Sec. 5.3, and prompts for two lattice constants,
a, c, by

tetragonal-I  lattice selected,  code = 10
Basic lattice constants A,C :

which concludes the lattice definition.

>   [J]  selected from submenu LK confirms a primitive hexagonal lattice,
see Sec. 5.3, and prompts for two lattice constants, a, c, by

hexagonal-P  lattice selected,  code = 10
Basic lattice constants A,C :

which concludes the lattice definition.

>   [K]  selected from submenu LK confirms a trigonal rhombic lattice, see
Sec. 5.3, and prompts for one lattice constant, a, by

trigonal-R  lattice selected,  code = 10
Basic lattice constants A :

and for one angle, <(R1,R2), by

Angle  <(R1,R2) :

which concludes the lattice definition.

>   [L]  selected from submenu LK confirms a primitive cubic lattice, see
Sec. 5.3, and prompts for one lattice constant, a, by

cubic-P  lattice selected,  code = 10
Basic lattice constants A :

which concludes the lattice definition.

>   [M]  selected from submenu LK confirms a body centered cubic lattice,
see Sec. 5.3, and prompts for one lattice constant, a, by

cubic-I  lattice selected,  code = 10
Basic lattice constants A :

which concludes the lattice definition.

>   [N]  selected from submenu LK confirms a face centered cubic lattice,
see Sec. 5.3, and prompts for one lattice constant, a, by

cubic-I  lattice selected,  code = 10
Basic lattice constants A :

which concludes the lattice definition.

>   [,]  selected from submenu LK returns to the lattice option menu L if
the lattice is built from scratch or else moves to the
BALSAC/LATTICE main option menu, see Sec. 6.2.0.

The selection of a Bravais lattice is followed by a prompt

Global lattice scaling constant  a=

asking for a global lattice constant a to scale all lattice vectors
(a = 1.0 yields no scaling). This completes the lattice definition and
BALSAC/LATTICE moves to the Miller index option (main option [M]) if the
lattice section is built from scratch or returns to the BALSAC/LATTICE
main option menu, see Sec. 6.2.0.