Figure 4

Zero-order polynomial fits to the ratio of neutral to charged pion transverse momentum distributions above 1 GeV/$c$ when the two photons (PCM-PCM, $\pi^0\rightarrow \gamma \gamma$) or one photon (PCM-Dalitz, $\pi^0\rightarrow e^+e^-\gamma $) are selected within the given radial interval. The open symbols are obtained with efficiency corrections using the default MC , while the full symbols are obtained when the $\Omega_i$ calibration factors are used to weight the efficiency (see Eq. 1).