 | Two-channel fit to the LHCb data of the double-$\jp$ invariant mass distribution~\cite{Aaij:2020fnh}. The solid line is the best fit with $\chisq=0.99$, and the band is the $1\sigma$ error area. The dotted line denotes $P(E)$ which perfectly describes the DPS distribution taken from the LHCb analysis~\cite{Aaij:2020fnh}. |
 | Two-channel fit to the LHCb data of the double-$\jp$ invariant mass distribution~\cite{Aaij:2020fnh}. The solid line is the best fit with $\chisq=0.99$, and the band is the $1\sigma$ error area. The dotted line denotes $P(E)$ which perfectly describes the DPS distribution taken from the LHCb analysis~\cite{Aaij:2020fnh}. |
 | Three-channel fits to the LHCb data~\cite{Aaij:2020fnh} of the double-$\jp$ invariant mass distribution. Fit~1 with $\chisq=0.97$ and Fit~2 with $\chisq=1.05$ are shown as the solid and dashed curves, respectively, together with the corresponding $1\sigma$ error bands. The dotted line is defined as in Fig.~\ref{fig:fit2c}. |
 | Three-channel fits to the LHCb data~\cite{Aaij:2020fnh} of the double-$\jp$ invariant mass distribution. Fit~1 with $\chisq=0.97$ and Fit~2 with $\chisq=1.05$ are shown as the solid and dashed curves, respectively, together with the corresponding $1\sigma$ error bands. The dotted line is defined as in Fig.~\ref{fig:fit2c}. |
 | Poles of the $T$-matrix from the 2-channel fit. |
 | Poles of the $T$-matrix from the 2-channel fit. The subplot zooms in the poles around 6.2~GeV. The effective couplings for the poles (namely, square-root of their residues) are encoded in color in the units of GeV. |
 | Poles of the $T$-matrix from the 2-channel fit. The subplot zooms in the poles around 6.2~GeV. The effective couplings for the poles (namely, square-root of their residues) are encoded in color in the units of GeV. |
 | Poles of the $T$-matrix from the 3-channel fits. {For the color coding, see the caption of Fig.~\ref{fig:pole2c}.} |
 | Poles of the $T$-matrix from the 3-channel fits. |
 | Poles of the $T$-matrix from the 3-channel fits. {For the color coding, see the caption of Fig.~\ref{fig:pole2c}.} |
 | Predictions for the invariant mass spectrum in the $\jpsip$ final state. |
 | Predictions for the invariant mass spectrum in the $\jpsip$ final state. |
 | Moduli of the $T$-matrix elements from the 2-channel fit. The dash-dotted line show the $J/\psi\psi(2S)$ threshold. |
 | Moduli of the $T$-matrix elements from the 2-channel fit. The dash-dotted line show the $J/\psi\psi(2S)$ threshold. |
 | Moduli of the $T$-matrix elements from the 3-channel fits. The dash-dotted lines show the $J/\psi\psi(2S)$ and $J/\psi\psi(3770)$ thresholds. |
 | Moduli of the $T$-matrix elements from the 3-channel fits. The dash-dotted lines show the $J/\psi\psi(2S)$ and $J/\psi\psi(3770)$ thresholds. |
 | Moduli of the $T$-matrix elements from the 3-channel fits. The dash-dotted lines show the $J/\psi\psi(2S)$ and $J/\psi\psi(3770)$ thresholds. |
 | Moduli of the $T$-matrix elements from the 3-channel fits. The dash-dotted lines show the $J/\psi\psi(2S)$ and $J/\psi\psi(3770)$ thresholds. |