Adding section for comparison of different numerical modelling methods.

docs/source/comparisons_analytical.rst

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+**********************
+Analytical comparisons
+**********************
+
+This section presents comparisons between analytical and modelled solutions.
+
+Hertzian dipole in free space
+=============================
+
+:download:`hertzian_dipole_fs.in <../../tests/analytical/hertzian_dipole_fs/hertzian_dipole_fs.in>`
+
+This example is of a Hertzian dipole, i.e. an additive source (electric current density), in free space.
+
+.. literalinclude:: ../../tests/analytical/hertzian_dipole_fs/hertzian_dipole_fs.in
+    :language: none
+    :linenos:
+
+The function ``hertzian_dipole_fs``, which can be found in the ``analytical solutions`` module in the ``tests`` sub-package, computes the analytical solution.
+
+Results
+-------
+
+:numref:`hertzian_dipole_fs_results` shows the time history of the electric and magnetic field components of the modelled and analytical solutions. The responses completely overlap one another due to their similarity. Therefore, :numref:`hertzian_dipole_fs_results_diffs` shows the percentage differences between the modelled and analytical solutions.
+
+.. _hertzian_dipole_fs_results:
+
+.. figure:: ../../tests/analytical/hertzian_dipole_fs/hertzian_dipole_fs_vs_analytical.png
+    :width: 600 px
+
+    Time history of the electric and magnetic field components of the modelled and analytical solutions.
+
+.. _hertzian_dipole_fs_results_diffs:
+
+.. figure:: ../../tests/analytical/hertzian_dipole_fs/hertzian_dipole_fs_vs_analytical_diffs.png
+    :width: 600 px
+
+    Percentage differences between the modelled and analytical solutions.
+
+The match between the analytical and numerically modelled solutions is excellent. The maximum difference is approximately 1%, which is observed in the Ez field component (the same direction as the Hertzian dipole source). The other electric field components exhibit maximum differences of approximately 0.5%, and the magnetic field components 0.25%.
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