2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/206361A large data set of charged-pion electroproduction from both hydrogen and deuterium targets has been obtained spanning the low-energy residual-mass region. These data conclusively show the onset of the quark-hadron duality phenomenon, as predicted for high-energy hadron electroproduction. We construct several ratios from these data to exhibit the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark-to- pion production mechanisms.11 pages, 3 figures, accepted in Phys. Rev. Lett. Tables addedHigh Energy Physics - Phenomenologytext