(top) Normalized transverse momentum correlator, $\sqrt{ \llangle \Delta p_{\rm T1}\Delta p_{\rm T2} \rrangle }/{\llangle p_{\rm T} \rrangle }$, shown as a function of the charged-particle multiplicity density, $\langle{\rm d}N_{\rm ch}/{\rm d}\eta \rangle$, in \PbPb collisions at \snn = 2.76  and 5.02 TeV; (bottom) Ratio of values of $\sqrt{ \llangle \Delta p_{\rm T1}\Delta p_{\rm T2} \rrangle }/{\llangle p_{\rm T} \rrangle }$ measured at \snn = 5.02 TeV to the corresponding results at \snn = 2.76 TeV. The statistical and systematic uncertainties for both energies are represented by vertical bars and boxes, respectively.