  We report the experimental study of an atom-chip interferometer using
ultracold rubidium 87 atoms above the Bose-Einstein condensation threshold. The
observed dependence of the contrast decay time with temperature and with the
degree of symmetry of the traps during the interferometer sequence is in good
agreement with theoretical predictions published in [Dupont-Nivet et al., NJP
18, 113012 (2016)]. These results pave the way for precision measurements with
trapped thermal atoms.
