Figure 1

Invariant mass distribution of opposite-sign dimuons with $p_{\rm T}>0$ for the different centrality and rapidity intervals considered in the analysis (see text for details). The solid blue line represents the total fit function (sum of two exponential and three extended Crystal Ball functions) and the dashed red line is the $\Upsilon$ signal component only. The green dotted line and the magenta dashed-dotted line represent the $\Upsilon$(1S) and the $\Upsilon$(2S) peaks, respectively.