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In view of the recent excitement about a tension between determinations off_Ds from experiment and from simulations of lattice QCD with dynamical quarks,we try to clear up the picture of lattice determinations in the continuum limitof the quenched approximation. For O(a) improved Wilson quarks we see linearscaling in the squared lattice spacing a^2 only for a<~0.08fm. For coarserlattices we observe significant contaminations from higher order cutoffeffects. As an aside we also study the scaling of the charm quark mass and theratio of the vector to the pseudo-scalar decay constant and the spin-splitting.

Lattice cutoff effects for F_Ds with improved Wilson fermions - a final lesson from the quenched case