Fig. 4.

Normalized residuals of ${\text{EBHLS}}_2$ fits to the BESIII, CMD2 and SND $3\pi$ data under two different configurations: top panels correspond to a (global) fit with only one energy shift for the BESIII spectrum; the bottom ones are derived allowing different $\delta E_{\mathrm{BESIII}}^{\omega }$ and $\delta E_{\mathrm{BESIII}}^{\varphi }$. The partial ${\chi }^2/N$ are displayed for the BESIII sample on the one hand, and for the CMD2 and SND ones (NSK) on the other hand