Ajouter nuage de point

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\documentclass[french,11pt]{report}
\usepackage{pgfplots}
\usetikzlibrary{calc,angles,positioning,intersections,quotes,decorations.markings}
\begin{document}
    \begin{tikzpicture}
        \draw [domain=-2:10] grid[step=0.5] (5,5);
        \foreach \y in {0.25,0.75,...,5}{
        \foreach \x in {0.25,0.75,...,5}{
          \fill[red] (\x,\y) circle [radius=0.05];
        }}
        \draw[color=gray,decorate,decoration={brace,raise=0.1cm}]
(5,0.5) -- (5,0) node[right=0.25, pos=0.5] {Sous-cube de volume $\log(\rho)$};
    \end{tikzpicture}
\end{document}
 
 
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