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We present measurements of untriggered di-hadron correlations as a functionof centrality in Pb-Pb \sNN collisions, for charged hadrons with $p_{T} > 0.15$GeV$/c$. These measurements provide a map of the bulk correlation structures inheavy-ion collisions. Contributions to these structures may come from jets,initial density fluctuations, elliptic flow, resonances, and/or momentumconservation. We decompose the measured correlation functions via amulti-parameter fit in order to extract the nearside Gaussian, the longer range$\Delta \eta$ correlation often referred to as the soft ridge. The effect ofincluding higher harmonics ($v_{3}$ and $v_{4}$) in this procedure will bediscussed. We investigate how the nearside Gaussian scales with the number ofbinary collisions. Finally, we show the charge dependence of the nearsideGaussian.

Untriggered di-hadron correlations in Pb-Pb collisions at $\sqrt{s_{NN}} =$ 2.76 TeV from ALICE