# distance

Define a center-of-mass distance between two groups of atoms This command can appear in the global context.

### Options

atoms

Atoms in two groups (1-indexed).

This option is mandatory.

• The type is ([int], [int])
• There is no default value.
• The value must be positive
value

Reference distance between the center-of-masses of two groups. If not supplied, the starting distance will be used.

• The type is quantity
• There is no default value.