ATC: fix_modify AtC add_molecule

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### fix_modify AtC add_molecule

#### syntax

fix_modify_AtC add_molecule <small|large> <TAG> <GROUP_NAME>

- small|large = can be small if molecule size < cutoff radius, must be large otherwise
- <TAG> = tag for tracking a species
- <GROUP_NAME> = name of group that tracking will be applied to

#### examples

`group WATERGROUP type 1 2`
`fix_modify AtC add_molecule small water WATERGROUP`

#### description

Associates a tag with all molecules corresponding to a specified group.

#### restrictions

#### related

#### default

No defaults for this command.