Fig. 4.

$e^{+}{e}^{-}\to {\mathit{\pi }}^0\mathit{\gamma }$ cross section predicted from $e^{+}{e}^{-}\to 3\mathit{\pi }$ (left fit with $\mathit{\omega }$ and $\mathit{\varphi }$ only, right fit including ${\mathit{\omega }}^{\prime }$, ${\mathit{\omega }}^{\prime \prime }$), compared to the data of [85–87]. The inserts again zoom in on the $\mathit{\omega }$ and $\mathit{\varphi }$ resonance peaks. The error band represents the variation found by changing the $\mathit{\pi }\mathit{\pi }$ phase shifts, ${\mathit{\Lambda }}_{3\mathit{\pi }}$, and the $e^{+}{e}^{-}\to 3\mathit{\pi }$ data base as described in the main text