.. note::
    :class: sphx-glr-download-link-note

    Click :ref:`here <sphx_glr_download_modeling_gallery_spectral_plot_absorption.py>` to download the full example code
.. rst-class:: sphx-glr-example-title

.. _sphx_glr_modeling_gallery_spectral_plot_absorption.py:


.. _absorption-spectral-model:

Absorption Spectral Model
=========================

This model represents EBL absorption models.

They are usually used as part of `~gammapy.modeling.models.AbsorbedSpectralModel`

Example plot
------------
Here we illustrate how to create and plot EBL absorption models for a redshift of 0.5:


.. code-block:: default


    from astropy import units as u
    import matplotlib.pyplot as plt
    from gammapy.modeling.models import Absorption

    redshift = 0.5
    dominguez = Absorption.read_builtin("dominguez").table_model(redshift)
    franceschini = Absorption.read_builtin("franceschini").table_model(redshift)
    finke = Absorption.read_builtin("finke").table_model(redshift)

    plt.figure()
    energy_range = [0.08, 3] * u.TeV
    opts = dict(energy_range=energy_range, energy_unit="TeV", flux_unit="")
    franceschini.plot(label="Franceschini 2008", **opts)
    finke.plot(label="Finke 2010", **opts)
    dominguez.plot(label="Dominguez 2011", **opts)

    plt.ylabel(r"Absorption coefficient [$\exp{(-\tau(E))}$]")
    plt.xlim(energy_range.value)
    plt.ylim(1e-4, 2)
    plt.title(f"EBL models (z={redshift})")
    plt.grid(which="both")
    plt.legend(loc="best")



.. image:: /modeling/gallery/spectral/images/sphx_glr_plot_absorption_001.png
    :class: sphx-glr-single-img






.. _sphx_glr_download_modeling_gallery_spectral_plot_absorption.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download

     :download:`Download Python source code: plot_absorption.py <plot_absorption.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: plot_absorption.ipynb <plot_absorption.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_