The CLUMPY library includes a modified version of the HEALPix v3.31 C++ libraries distributed under the GNU General Public License (GPLv2). This makes CLUMPY available under the same license — Copyright © V. Bonnivard, A. Charbonnier, C. Combet, M. Hütten, D. Maurin and E. Nezri (2010-2018).
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Copyright © M. Oppermann (2017), courtesy of the author’s permission under the CC BY-NC-ND license.
The GNU Scientific Library (GSL) is a numerical library for C and C++ programmers. It is free software under the GNU General Public License.
Copyright (Unpublished-all rights reserved under the copyright laws of the United States), U.S. Government as represented by the Administrator of the National Aeronautics and Space Administration. No copyright is claimed in the United States under Title 17, U.S. Code. Permission to freely use, copy, modify, and distribute this software and its documentation without fee is hereby granted, provided that this copyright notice and disclaimer of warranty appears in all copies — CFITSIO was developed by Dr. William D. Pence, Astronomical Data Analysis Software and Systems VIII, ASP Conference Series, Vol. 172 (1999).
The HEALPix (Hierarchical Equal Area isoLatitude Pixelisation) is distributed under the GNU GPLv2 — Gorski et al., ApJ 622, 759 (2005).
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The doxygen system is licensed under the GNU General Public License v2 — Copyright © 1997-2016 by Dimitri van Heesch.