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We present details of our evaluation of the NNLO QCD corrections to BR(B ->X_s gamma) in the heavy charm limit m_c >> m_b/2. Results of this calculationhave been essential for estimating O(alpha_s^2) effects in this branching ratiovia interpolation in m_c.

Large-m_c Asymptotic Behaviour of O(alpha_s^2) Corrections to B -> X_s gamma