Wie erstelle ich ein Stärke-Diagramm?

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\documentclass[tikz]{standalone}
\usepackage{pgfplots,amsmath}
\begin{document}
\begin{tikzpicture}[dot/.style={draw,circle,inner sep=1pt}]
  \begin{axis}[
    clip=false,
    xlabel = {Technische Wertigkeit $W_t$},
    ylabel = {Wirtschaftliche Wertigkeit $W_w$},
    enlargelimits=false,
    minor tick num=1,
    grid = both,
    ]
    \addplot[dashed] coordinates { (0,0) (1,1) };
    \addplot table[x index=0,y index=1] {
      0.52  0.50
      0.68  0.53
      0.82  0.83
    };
    \node[dot,pin={200:$W_{\text{ideal}}$}] at (axis cs:1,1) {};
    \node[below] at (axis cs:0.52,0.50) {$W_1$};
    \node[right] at (axis cs:0.68,0.53) {$W_2$};
    \node[left] at (axis cs:0.82,0.83) {$W_3$};
    \path (axis cs:0.52,0.50) --
    node[pin={[text width=2cm,align=center]-60:Entwicklungs\-schritte}] {}
    (axis cs:0.68,0.53);
  \end{axis}
\end{tikzpicture}
\end{document}
 
 
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