Acceptance$\times$efficiency as a function of transversemomentum ($\pt$) for deuterons (left) and for $\rm ^{3}He$ (middle) in Pb-Pb collisions at $\snn$ = 2.76 TeV, as well as for deuterons in pp collisions at $\sqrt{s}$ = 7 TeV (right panel). The curves represent afit with the function presented in Eq. 2 (see text for details).