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# Legacy functionality

Sometimes features are removed from ASE. These features may still be useful, and can be found in version history, only we can’t support them.

Common reasons for removing a feature is that is that the feature is unused, buggy or broken, untested, undocumented, difficult to maintain, or has possible security problems.

Below is a list of removed features.

Removed in 3.23.0 | MR | Comment
--- | --- | ---
`ase.io.gaussian_reader` | !2329 | No tests or documentation

Removed in 3.21.0 | MR | Comment
--- | --- | ---
`ase.calculators.ase_qmmm_manyqm` | !2092 | Has docs but lacks real tests
`ase.build.voids` | !2078 |
Unused code in `ase.transport.tools` | !2077 |
`ase.io.iwm` | !2064 |
`ase.visualize.primiplotter` | !2060 | Moved to asap3
`ase.visualize.fieldplotter` | !2060 | Moved to asap3
`ase.io.plt` | !2057 |

Removed in 3.20.0 | MR | Comment
--- | --- | ---
dacapo-netcdf in `ase.io.dacapo` | !1892 |
`ase.build.adsorb` | !1845 |
Unused code in `ase.utils.ff` | !1844 |
`ase.utils.extrapolate` | !1808 | Moved to GPAW
`ase/data/tmgmjbp04n.py` | !1720 |
`ase/data/tmfp06d.py` | !1720 |
`ase/data/gmtkn30.py` | !1720 |
`ase/data/tmxr200x_tm3r2008.py` | !1720 |
`ase/data/tmxr200x_tm2r2007.py` | !1720 |
`ase/data/tmxr200x_tm1r2006.py` | !1720 |
`ase/data/tmxr200x.py` | !1720 |
`ase.calculators.jacapo` | !1604 |
`ase.calculators.dacapo` |  |
`ase.spacegroup.findsym` |  | Use spglib