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Figure 2

Invariant-mass distributions of \kzero\ (top left), \lmb\ (top right), \X\ (bottom left) and \Om\ (bottom right) decay candidates in selected \pt\ ranges for the corresponding highest V0M event multiplicity classes in pp collisions at $\sqrt{s}$ = 7 TeV. The statistical uncertainties are shown by error bars and the shaded bands on the sides of the peak represent the regions used to estimate the background. The red dashed curves represent fits using a gaussian peak and a linear background.
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