Pair transverse mass dependence of the pion~ and kaon~ femtoscopic radii for different event centralities in \PbPb\ collisions at \sqrtSnn~= 2.76 \TeV. The measured $R_{\rm out}$, $R_{\rm side}$, $R_{\rm long}$ are reported in the left, right top and bottom panel, respectively. The experimental data are reported with solid symbols together with statistical and systematic uncertainties. Bands represent theoretical predictions of pion radii by a (3+1)D hydrodynamic model coupled to the Therminator code~ for the same centralities as in data, selected based on the impact parameter b in the calculation Lines represent calculations for central collisions by the HKM model with and without rescattering~.