Relative dynamical fluctuation $\sqrt{C_m}/M(\pt)_m$ as a function of $\langle \rm{d}N_{\rm ch}/\rm d\eta \rangle$ in pp and Pb-Pb collisions at $\snn$ = 2.76 TeV. Also shown are results from HIJING and power-law fits to pp (solid line) and HIJING (dashed line) (see text).