Left: Distribution of the number of $\pi^{0}$ mesons collected in an ideal calorimeter (black). The respective contributions of the 10 EMCal, 6 2/3-sized DCal and 4 1/3-sized SMs are displayed in different colors (see Sec. 2.2). Right: Distributions of the smeared $\pi^{0}$ meson masses normalized by $M_{\pi^{0}}^{\rm PDG}$, when only the statistical uncertainty is applied (closed symbols), and when also the uncertainty due to the fit range is applied (opened symbols).