# Frame selection

`FrameSelection` maps PolyzyMD equilibration/window semantics to MDAnalysis
`AnalysisBase.run()` kwargs. It supports either `start`/`stop`/`step` or an
explicit `frames` selector, but not both.

```{eval-rst}
.. automodule:: polyzymd.analyses.mda.frame_selection
   :members:
   :undoc-members:
   :show-inheritance:
   :no-index:
```