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How to load Batoms from a collection?
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When we restart from a ``.blend`` file. We can rebuild the :class:`Batoms` objects from collections. Keyword ``label`` in :class:`Batoms` object is uesd to load a :class:`Batoms` collection by the name.


Molecule:

>>> from batoms import Batoms
>>> co = Batoms(label = 'co')

.. image:: /images/ase-co.png
   :width: 3cm

Crystal:

>>> from batoms import Batoms
>>> fe = Batoms(label = 'fe')

.. image:: /images/ase-fe.png
   :width: 3cm