Légende d'un graphique

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\documentclass{article}
\usepackage{pgfplots}
\usepackage{pgfplotstable}
\pgfplotsset{compat=1.16}
\colorlet{bleuturquoise}{cyan}
\usepackage{siunitx}
\usepackage{filecontents}
\begin{filecontents*}{test.txt}
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1000 1
\end{filecontents*}
\begin{document}
\begingroup
\centering
\begin{tikzpicture}
    \begin{axis}[
            title={Taille des particules de F127 pour $c_{m} = \SI{20}{g.L^{-1}}$ pour différents mélanges eau:THF},
            xlabel={taille (nm)},
            xmode=log,
            ylabel={intensité (u.a.)},
            ymax=50,
            mark size=0.5pt,
            width=1\textwidth,
            legend style={at={(0.5,-0.15)},anchor=north},
        legend columns=5,
    ]
        \addplot [red,thick,smooth] table {test.txt};
        \addplot [purple,thick,smooth] table[x index = 0, y expr={\thisrowno{1} + 6}] {test.txt};
        \addplot [blue,thick,smooth] table[x index = 0, y expr={\thisrowno{1} + 12}] {test.txt};
        \addplot [bleuturquoise,thick,smooth] table[x index = 0, y expr={\thisrowno{1} + 18}] {test.txt};      
        \addplot [black,thick,smooth] table[x index = 0, y expr={\thisrowno{1} + 24}] {test.txt};  
                \legend{$d=2$,$d=3$,$d=4$,$d=5$,$d=6$},
    \end{axis}
\end{tikzpicture}
\endgroup
 
 
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    \documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
\usepackage{pgfplotstable}
\pgfplotsset{compat=1.14}
\colorlet{bleuturquoise}{cyan}
\usepackage{siunitx}
\usepackage{filecontents}
\begin{filecontents*}{test.txt}
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10 4
100 2
1000 1
\end{filecontents*}
\DeclareRobustCommand{\CourbeRD}{(\tikz[baseline=-\the\dimexpr\fontdimen22\textfont2\relax,inner sep=0pt] \draw[red,line width=0.5pt](0,0) -- (5mm,0);)}
\DeclareRobustCommand{\CourbePL}{(\tikz[baseline=-\the\dimexpr\fontdimen22\textfont2\relax,inner sep=0pt] \draw[purple,line width=0.5pt](0,0) -- (5mm,0);)}
\DeclareRobustCommand{\CourbeBU}{(\tikz[baseline=-\the\dimexpr\fontdimen22\textfont2\relax,inner sep=0pt] \draw[blue,line width=0.5pt](0,0) -- (5mm,0);)}
\DeclareRobustCommand{\CourbeBL}{(\tikz[baseline=-\the\dimexpr\fontdimen22\textfont2\relax,inner sep=0pt] \draw[black,line width=0.5pt](0,0) -- (5mm,0);)}
\DeclareRobustCommand{\CourbeBT}{(\tikz[baseline=-\the\dimexpr\fontdimen22\textfont2\relax,inner sep=0pt] \draw[bleuturquoise,line width=0.5pt](0,0) -- (5mm,0);)}
\begin{document}
\begin{figure}[ht]
\centering
\begin{tikzpicture}
    \begin{axis}[
            xlabel={taille (nm)},
            xmode=log,
            ylabel={intensité (u.a.)},
            ymax=30,
            y tick label style={rotate=90,anchor=south},
            mark size=0.5pt,
            enlargelimits=false,
            width=1\textwidth,
    ]
        \addplot [red,thick,smooth] table {test.txt};
        \addplot [purple,thick,smooth] table[x index = 0, y expr={\thisrowno{1} + 6}] {test.txt};
        \addplot [blue,thick,smooth] table[x index = 0, y expr={\thisrowno{1} + 12}] {test.txt};
        \addplot [bleuturquoise,thick,smooth] table[x index = 0, y expr={\thisrowno{1} + 18}] {test.txt};      
 
 
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