Tomography of cool giant and supergiant star atmospheres - III. Validation of the method on VLTI/AMBER observations of the Mira star S OriKateryna Kravchenko, Markus Wittkowski, Alain Jorissen, Andrea Chiavassa, Sophie Van Eck, Richard I. Anderson, Bernd Freytag and Ulli KäuflA&A, 642 (2020) A235DOI: https://doi.org/10.1051/0004-6361/202038581