Figure 1

(K, $\pi$) (top row) and (K, $\pi$, $\pi$) (central row) invariant-mass distributions for the centrality class 0-10%. Bottom row: Distribution of the mass difference $\Delta M=M({\rm K}\pi\pi)-M({\rm K}\pi)$ for the centrality class 0-10%. The distributions are reported in three $\pt$ intervals for each meson (left, middle and right column). The fit functions used to describe the background (dash), the background without signal reflections (only for $\Dzero$, long-dash) and the total distribution including the signal (solid) are shown.