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. 2022 Feb 28;82(2):184. doi: 10.1140/epjc/s10052-022-10096-4

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© The Author(s) 2022

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Fig. 8 — ${BHLS}_{2}$ fit to the $π π$ data, the upgraded BS solution: the left-hand panel shows the pion form factor squared in the $e^{+} e^{-}$ annihilation, and the right-hand one displays the same spectrum in the $τ$ decay. The fitted regions extend up to $s = 1.0$ ${GeV}^{2}$