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We consider the effects of quark masses to the perturbative thrust in$e^+e^-$ annihilation. In particular we show that perturbative powercorrections resulting from non-zero quark masses considerably alters the sizeof the non-perturbative power corrections and consequently, significantlychanges the fitted value of $\alpha_s$.Comment: Latex, 6 pages, 2 figures, minor change in text, added one referenc

Quark mass corrections to the perturbative thrust and its effect on the determination of αs