Related paper Production of charged pions, kaons and protons at large transverse momenta in pp and Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV Distributions of the Cherenkov angle measured in the HMPID for positive tracks in a narrow $\pt$ bin, for $0-5\%$ central Pb-Pb (left) and pp (right) collisions.[png] [eps][png] [eps]