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We present the first measurement of pion source radii in Pb-Pb collisions atthe LHC. The radii were obtained by analyzing the Bose-Einstein enhancement intwo-pion correlation functions. Like at lower energies, the radii drop withincreasing transverse momentum, indicating presence of collective expansion. Inabsolute terms, all three radii (Rout, Rside, Rlong) are larger than at RHIC,roughly consistent with a linear scaling with the cube root of the particlemultiplicity.

Two-pion Bose-Einstein correlations in Pb-Pb collisions at 2.76 TeV with ALICE