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Figure 1

Fits to the invariant mass distributions of opposite-sign dimuons with $p_{\rm T}< 20$ GeV/$c$. The left plot refers to $2.03< y_{\rm {cms}}< 3.53$, and that on the right to $-4.46< y_{\rm {cms}}< -2.96$. The shapes of both the resonances and the background are also shown.
[png]   [pdf]   [eps]
[png]   [pdf]   [eps]