\section*{Supporting Information}

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\begin{figure*}[h]
\includegraphics[width=15.5cm,keepaspectratio]{Si_on_graphene.pdf}
\caption{STEM/MAADF images of silicon-substituted graphene. a) Overview of the lattice with many point defects as well as individual and clustered impurities. b) An individual silicon atom in 4-coordinated configuration. c) Three nearby silicon impurities.\label{fig:SIfig1}}
\end{figure*}

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