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Band2/Grafiken/B2_3.tikz

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+\begin{tikzpicture}[line cap=round,line join=round,x=1cm,y=1cm]
+\tikzset{
+        every pin/.style={fill=yellow!50!white,rectangle,rounded corners=3pt,font=\tiny},
+        small dot/.style={fill=black,circle,scale=0.5},}
+\begin{axis}[
+        axis x line=middle,
+        x=3cm,
+        width=40mm,
+        height=20mm,
+        xmin=0.5,
+        xmax=3.5,
+        xtick = \empty,
+        x axis line style={thick,-latex},
+        xlabel style={anchor=north west},
+        axis y line=none,
+        anchor=left of origin,
+xlabel=$x$,
+extra x ticks={1, 2, 3},
+extra x tick labels={$x_0 - C$, $x_0$, $x_0+C$},
+]
+\draw [line width=2] (axis cs: 1,0) -- (axis cs: 3,0);
+\addplot[only marks, fill=white, thick] coordinates {(1,0)};
+\addplot[only marks, fill=white, thick] coordinates {(2,0)};
+\addplot[only marks, fill=white, thick] coordinates {(3,0)};
+\end{axis}
+
+\end{tikzpicture}