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\begin{tikzpicture}[
scale=1.5,
coarse/.style={circle,draw=gray,inner sep=4pt},
ibase/.style={coarse,draw=black,very thick},
fine/.style={cross out,draw=gray,minimum size=8pt},
wantedfine/.style={fine,draw=black,ultra thick},
arrow/.style={-{Latex[length=2mm]},thick}
]
\foreach \x in {-3.5,...,3.5}
\node[coarse] at (\x,0){ };
\foreach \x in {-7,...,7}
\node[fine] at (\x*0.5,0){ };
\node[wantedfine] at (0,0){ };
\node[ibase] at (-1.5,0){ };
\node[ibase] at (-0.5,0){ };
\node[ibase] at (0.5,0){ };
\node[ibase] at (1.5,0){ };
\draw[arrow] (0,0.8) node[right] {Gesuchter Wert \(\interpol{\star}{x_{g \to f}^f}\)} -- (0,0.3);
\draw[arrow] (-1.5,-0.8) node[below right] {Bekannte Werte \(\interpol{\star}{\U_{g \to f}^g}\)} -- (-1.5,-0.3);
\draw[arrow] (-0.5,-0.8) -- (-0.5,-0.3);
\draw[arrow] (0.5,-0.8) -- (0.5,-0.3);
\draw[arrow] (1.5,-0.8) -- (1.5,-0.3);
\end{tikzpicture}
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