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Recent $N_f=2+1$ lattice data for meson-meson scattering in $p$-wave andisospin $I=1$ are analyzed using a unitarized model inspired by ChiralPerturbation Theory in the inverse-amplitude formulation for two and threeflavors. Chiral extrapolations are performed that postdict phase shiftsextracted from experiment quite well. In addition, the low-energy constants arecompared to the ones from a recent analysis of $N_f=2$ lattice QCD simulationsto check for the consistency of the hadronic model used here. Someinconsistencies are detected in the fits to $N_f=2+1$ data, in contrast to theprevious analysis of $N_f=2$ data.

Chiral Extrapolations of the $\boldsymbol{\rho(770)}$ Meson in $\mathbf{N_f=2+1}$ Lattice QCD Simulations