Introduction
============

.. figure:: /figures/EXT-PF1-Stage2_dataflow.png

This is the section that should contain the summary flowchart of the :term:`Processing Function`, where the products that will be described should appear quite clearly. In principle, this flow-chart should be no different from the one already present in the RSD and possibly in the Software Design Document, and at least we encourage to have a single flow-chart between the RSD and the :term:`DPDD`. The idea is to guide the reader of the DPDD toward a more detailed understanding of the role of the products in the pipeline.