PDF positivity
==============

These pseudo-observables can be used to enforce the positivity of PDFs in a PDF fit
:cite:`Candido:2020yat,Collins:2021vke,Candido:2023ujx`.
This is a built-in interface.

Pinecard structure
------------------

- The ``positivity.yaml`` file (compulsory). This file contains the |pid| and kinematics of the pseudo-observable.

Additional metadata
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No additional metadata is written.

Output
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No additional output files are created.