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We compute the one-loop partition function and analyze the conditions fortadpole cancellation in type I theories compactified on tori in the presence ofinternal oblique magnetic fields. We check open - closed string channel dualityand discuss the effect of T-duality. We address the issue of the quantumconsistency of the toroidal model with stabilized moduli recently proposed byAntoniadis and Maillard (AM). We then pass to describe the computation ofone-loop threshold corrections to the gauge couplings in models of this kind.Finally we briefly comment on coupling unification and dilaton stabilization inphenomenologically more viable modelsComment: 34 pages, 2 figures; references added, major changes to the  discussion of the model proposed by Antoniadis and Maillar

Gauge thresholds in the presence ofobliquemagnetic fluxes