Analysis of charm quark fragmentation at 10.5 GeV, based on a data sample of 103 fb collected by the CLEO experiment. Fragmentation into D±s and D∗±s mesons is studied. This analysis can be used to constrain charm fragmentation in Monte Carlo generators. The branching ratios B1=B(D∗+s→D+sγ)B(D+s→ϕπ+)B(ϕ→K+K−) and B2=B(D+s→ϕπ+)B(ϕ→K+K−), are not unfolded.
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