### x, y, z

Set the cell origin, always defined as the position of the node (000).
For

**conventional**,

**primitive**,

**wigner** and

**rhombus** volumes, the origin is initially at the lower-left
corner. For

**sphere** and

**projection** volumes, the origin
is initially at the center. When the volume is

**projection**,
the origin cannot be changed.

Example: **<cell ... x="0.0" y="0.0" z="0.0"/>** (default)
(defined in **GAMGI_MESA_CELL_X**, **GAMGI_MESA_CELL_Y** and **GAMGI_MESA_CELL_Z**)
Allowed values: real (optional, coupled)

### e1, e2, e3

Set the three Euler angles controlling the cell orientation. The first
rotation (e1), around the initial y axis, must be between

**0**
and

**180** degrees. The second rotation (e2), around the initial
z axis, must be between

**0** and

**360** degrees. The third rotation
(e3), around the final z axis, must be between

**0** and

**360**.

By default (e1, e2 and e3 equal to zero), the first crystallographic
vector is aligned along the x-axis, the second vector lies above, on
the x-y plane, and the third vector has a positive z coordinate, thus
pointing to the user (right-handed orientation).

Example: **<cell ... e1="0.0" e2="0.0" e3="0.0"/>** (default)
(defined in **GAMGI_MESA_CELL_E1**, **GAMGI_MESA_CELL_E2** and **GAMGI_MESA_CELL_e3**)
Allowed values: e1: **0.0** - **180.0**, e2, e3: **0.0** - **360.0** (optional, coupled)