Introduction
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The `Internal Data` processing functions characterise the selection functions of the photometric and spectroscopic catalogs, which are needed for the statistical analyses carried out in Level 3.

This section contains the data products for the following internal data `PF`:

* :ref:`PF-VMPZ-ID`: Photometric redshift selection function [**Priority 1**]
* :ref:`PF-VMSP-ID`: Spectroscopic redshift selection function [**Priority 1**]
* :ref:`PF-SEL-ID`: Selection and estimation of purity and completeness of the spectroscopic sample [**Priority 1**]