# crystod.phonon

```{eval-rst}
.. automodule:: crystod.phonon
   :members:
   :undoc-members:
   :show-inheritance:
   :exclude-members: IsotropySubgroup

.. py:class:: IsotropySubgroup
   :module: crystod.phonon

   Alias of :class:`crystod.group.IsotropySubgroup`, the record type of the
   ``subgroups`` of an :class:`ImaginaryModeResult` (the same class object,
   exported from both namespaces; it is documented once, under
   ``crystod.group``).
```