.. _fundamentals:

============
Fundamentals
============

This section introduces the physics of X-ray Photon Correlation Spectroscopy,
explains how the **heterodyne** package models two-component dynamics, and
provides a reference for all 16 model parameters.

.. toctree::
   :maxdepth: 1

   what_is_xpcs
   heterodyne_overview
   parameter_guide
