Wie kann ich in pgfplots Kurven glätten?

\documentclass{scrartcl}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}          
\usepackage{pgfplots}
\pgfplotsset{
    compat=newest
}
\usepgfplotslibrary{fillbetween}

\begin{document}

\begin{tikzpicture}[scale=1.2]
\begin{axis}[
legend pos=north west,
style=thick,
xlabel=\sffamily\footnotesize\ Menge in \%,
ylabel=\sffamily\footnotesize Wert in \%,
minor tick num=3,
% xtick=data,
% xticklabels={,,20,40,60,80,100}
x tick label style={font=\sffamily\tiny},
y tick label style={font=\sffamily\tiny},
grid=both,
domain=0:100,% Plotbereich von 0 bis 100%
enlarge x limits=false,% keine Verlängerung der x-Achse
ymin=0,
]
\addplot+[name path=P,smooth,black,mark options={black},
]
coordinates{
    % BEGIN RECEIVE ORGTBL sec-abc-analyse-1-1
    (0,0)
    (1.76,42.43)
    (4.16,75.68)
    (6.3,82.8)
    (35.09,87.59)
    (37.49,91.9)
    (49.49,95.89)
    (50.93,98.28)
    (98.92,99.61)
    (99.04,99.9)
    % END RECEIVE ORGTBL sec-abc-analyse-1-1
};
\legend{\footnotesize\sffamily{\bfseries\textcolor{red!70!white}{A}/
        \textcolor{yellow!70!white}{B}/
        \textcolor{green!60!black}{C}-Güter}}
% Füllung
\addplot[name path=X,draw=none]{0}; % entspricht x-Achse
\addplot[red!70!white] fill between [of=P and X, soft
% Fläche A-Gut
clip={domain=0 : 4.16}];
\addplot[yellow!70!white] fill between [of=P and X, soft
% Fläche B-Gut
clip={domain=4.16 : 37.49}];
\addplot[green!60!black] fill between [of=P and X, soft
% Fläche C-Gut
clip={domain=37.49 : 100}];
\end{axis}
\end{tikzpicture}
\end{document}