\begin{tikzpicture}
       \begin{axis}[%
               xmin=-25, xmax=25,
               ymin=-2500, ymax=2500]
               \addplot graphics [xmin=-25, xmax=25, ymin=-2500, ymax=2500] {example-grid-100x100bp.png};
       \end{axis}
\end{tikzpicture}%

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