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The pair-angle distribution function (PADF) is a three- and four-atomcorrelation function that can characterise the local angular structure ofdisordered materials, particles or nanocrystalline materials. The PADF can bemeasured by x-ray or electron fluctuation diffraction experiments, which can becollected by scanning a small beam across a structurally disordered sample orflowing a sample across the beam path. It is a natural generalisation of theestablished pair-distribution methods, which do not provide angularinformation. This software package provides tools to calculate the PADF fromfrom fluctuation diffraction data. The package includes tools for calculatingthe intensity correlation function, which is a necessary step in the PADFcalculation and also the basis for other fluctuation scattering techniques.

The pypadf package: computing the pair-angle distribution function from fluctuation scattering data