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\subsection{Closing Plots (Filling the Area Under Plots)}
\begin{command}{\closedcycle}
Provide |\closedcycle| as \meta{trailing path commands} after |\addplot| to draw a closed line from the last plot coordinate to the first one.
Use |\closedcycle| whenever you intend to fill the area under a plot.
\begin{codeexample}[]
\begin{tikzpicture}
\begin{axis}
\addplot {x^2+2} \closedcycle;
\end{axis}
\end{tikzpicture}
\end{codeexample}
\begin{codeexample}[]
\begin{tikzpicture}
\begin{axis}
\addplot+[fill] {x^2+2} \closedcycle;
\end{axis}
\end{tikzpicture}
\end{codeexample}
In case of stacked plots, |\closedcycle| connects the current plot with the previous plot instead of connecting with the $x$~axis\footnote{The implementation for stacked plots requires some additional logic to determine the filled area: \lstinline{\\closedcycle} will produce a \texttt{plot coordinates} command with \emph{reversed} coordinates of the previous plot. This is usually irrelevant for end users, but it assumes that the plot's type is symmetric. Since constant plots are inherently asymmetric, \lstinline{\\closedcycle} will use \texttt{const plot mark right} as reversed sequence for \texttt{const plot mark left}.}.
\begin{codeexample}[]
\begin{tikzpicture}
\begin{axis}[stack plots=y]
\addplot+[fill] coordinates
{(0,1) (1,1) (2,2) (3,2)} \closedcycle;
\addplot+[fill] coordinates
{(0,1) (1,1) (2,2) (3,2)} \closedcycle;
\end{axis}
\end{tikzpicture}
\end{codeexample}
\end{command}
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