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## Option: center

#### Syntax

`-center <index>`

#### Description

This option shifts all atoms so that the atom with the given <index> is at the center of the box.

If <index>=0 or "com", then all atoms are shifted so that the center of mass is at the center of the box.

#### Default

By default the system is not centered.

#### Examples

- `atomsk initial.cfg -center 23 final.xsf`

  This will read the file `initial.cfg` and shift all atoms so that the atom #23 is exactly at the center of the cell. The result will be output to the file `final.xsf`.

- `atomsk initial.cfg -center com final.xsf`

  This will shift atoms so that their center of mass is at the center of the box.

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