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Zimmermann's superconductor impurity comparison
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We reproduce the impurity comparison from Zimmermann's paper.  The example does
take a few seconds to generate the results.

.. image:: /static/images/ZimmermannImpurityComparison.svg
    :align: center


The code can be found in ``./examples/zimmermann_impurity_comparison.py`` and
can be run with

.. code-block:: bash

    poetry run ./examples/zimmermann_impurity_comparison.py