  We present most recent PHENIX preliminary data on centrality dependence of
two-pion Bose-Einstein correlation functions measured in \sqrt{sNN}=200 GeV
Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). The data are
well described by assuming the source to be a L\'evy-stable distribution. The
L\'evy parameters, R, alpha, lambda are measured in 18 bins of transverse mass
(mT) for 4 centrality intervals. The L\'evy scale parameter R(mT) decreases
with mT and exhibits a clear centrality ordering which supports its geometrical
interpretation. The L\'evy exponent {\alpha}(mT) is independent of mT in every
centrality bin but shows some centrality dependence. At all centralities
{\alpha} is significantly different from that of a Gaussian ({\alpha} = 2) or
Cauchy ({\alpha} = 1) source distribution. The L\'evy strength parameter
{\lambda} was also investigated. We observed that {\lambda}(mT) decreases at
low mT and saturates around mT = 0.6 GeV/c2. In the already published 0-30%
centrality class, Monte Carlo simulations are found to be inconsistent with the
measurements, unless a significant reduction of the in-medium mass of the
etaprime meson is included.
