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\begin{tikzpicture}
\begin{axis}[
scale only axis,
height=8.75cm,
width=0.85*\textwidth,
mark size=0,
line width=0.5pt,
legend pos=south west,
xlabel=Horizontale Kanalposition,
ylabel=Druck,
y unit=N/m^2,
x unit=m,
x tick label style={/pgf/number format/.cd, use comma},
y tick label style={/pgf/number format/.cd, use comma}
]
\addplot table[
x=x, y=cubic,
col sep=semicolon,
/pgf/number format/read comma as period
]{img/data/poiseuille2d_bisected_re100_both.csv};
\addlegendentry{Druckverlauf bei Interpolationsordnung \(\mathcal{O}(h^4)\)};
\addplot table[
x=x, y=linear,
col sep=semicolon,
/pgf/number format/read comma as period
]{img/data/poiseuille2d_bisected_re100_both.csv};
\addlegendentry{Druckverlauf bei Interpolationsordnung \(\mathcal{O}(h^2)\)};
\draw [dotted] (axis cs:1.9,1.35) rectangle (axis cs:2.09,1.45);
\end{axis}
\begin{axis}[
yshift=4.5cm,
xshift=9cm,
scale only axis,
height=3cm,
width=4cm,
mark size=0,
line width=0.5pt,
ticks=none,
title=Übergangsbereich
]
\addplot table[
x=x, y=cubic,
col sep=semicolon,
/pgf/number format/read comma as period
]{img/data/poiseuille2d_bisected_re100_detail.csv};
\addplot table[
x=x, y=linear,
col sep=semicolon,
/pgf/number format/read comma as period
]{img/data/poiseuille2d_bisected_re100_detail.csv};
\draw [dashed,gray] (axis cs:1.98,\pgfkeysvalueof{/pgfplots/ymin}) -- (axis cs:1.98,\pgfkeysvalueof{/pgfplots/ymax});
\draw [dashed,gray] (axis cs:2.00,\pgfkeysvalueof{/pgfplots/ymin}) -- (axis cs:2.00,\pgfkeysvalueof{/pgfplots/ymax});
\end{axis}
\end{tikzpicture}
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