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Let $S$ be a Dedekind scheme with perfect residue fields at closed points,let $f: X\rightarrow S$ be a minimal regular arithmetic surface of fibre genusat least $2$ and let $f': X'\rightarrow S$ be the canonical model of $f$. It iswell known that $\omega_{X'/S}$ is relatively ample. In this paper we provethat $\omega_{X'/S}^{\otimes n}$ is relative very ample for all $n\geq 3$.

On Pluri-canonical Systems of Arithmetic Surfaces