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Current Exclusions
The v11 commands and features not provided in v12 are:
| Feature | Rationale for exclusion |
| recornorm | With version 12.5.0, this has been replaced and improved upon by the recorn mixing model. |
| thleqw | Rarely used command not yet implemented. |
| extend | Beginning with version 12.3.0, this has been replaced by the more flexible energies command. |
| background models | This has been replaced by v12's multiple source modeling techniques |
Additionally, we have withdrawn seldom-used fitting methods anneal and genetic. Future development will add new techniques.