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Abstract
Finite-range regularised (FRR) chiral effective field theory is presented in the context
of approximation schemes ubiquitous in modern lattice QCD calculations. Using FRR
techniques, the power-counting regime (PCR) of chiral perturbation theory can be estimated.
To fourth-order in the expansion at the 1% tolerance level, we find m_\pi < 180 MeV
for the PCR, extending only a small distance beyond the physical pion mass.