我有以下 tikz 图表。我希望图例中的文本更小一些。我更愿意将其缩放 0.5。有什么简单的方法可以做到这一点吗？提前致谢！
\documentclass[10pt,a4paper,ngerman]{scrreprt}
\usepackage{geometry}
\usepackage{pgfplotstable}
\usepackage{pgfplots}
\usepackage{verbatim}
\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{blindtext}
\usepackage{float}
\usepackage{makecell}
\usepackage{siunitx}
\usepackage{hyperref}
\usepackage{,graphicx,placeins}
\usepackage{caption}
\pgfplotsset{every axis legend/.append style={at={(0.5,-0.2)},anchor=north}}
\pgfplotsset{compat=1.17}
\begin{document}
\begin{figure}[H]
\begin{tikzpicture}
\begin{axis}[
grid=both,
xlabel={Uhrzeit in [h]},
ylabel={Wartezeit in [s]},
ymin=0,
ymax=55.435082191265906,
xmin=6,
xmax=19
]
\addplot[black]
coordinates{
(6,19.714285714285907) (7,17.414173228346648) (8,15.86666666666687) (9,15.117968750000136) (10,10.937606837606978) (11,15.951162790697827) (12,16.243478260869757) (13,20.82905405405423) (14,15.520279720279866) (15,16.44322580645179) (16,14.754666666666811) (17,14.783116883117078) (18,19.68227848101285) (19,14.841176470588383)
};
\addlegendentry{Durchschnitt} % here i want the smaller font size %
\addplot[red]
coordinates{
(6,0.2359500250003066) (7,1.071518255698571) (8,0.6504365116407858) (9,0.7447067990664618) (10,0.22871614119400085) (11,0.534234896555887) (12,1.2147781092474457) (13,1.2819929607640965) (14,0.4373824916617135) (15,0.5552616389471527) (16,0.41528276544320875) (17,0.7275856348732841) (18,1.0135369783306665) (19,3.552713678800501E-15)
};
\addlegendentry{Untere SD Hülle} % here i want the smaller font size %
\addplot[blue]
coordinates{
(6,41.17888800387077) (7,41.69703425197403) (8,37.833765218897895) (9,42.15804731911563) (10,35.76484552611063) (11,41.31045409644057) (12,40.77620227113837) (13,45.435082191265906) (14,41.91921488631313) (15,40.83993866894958) (16,40.4444824092698) (17,37.137716578028815) (18,42.989957303909605) (19,41.8468617029289)
};
\addlegendentry{Obere SD Hülle} % here i want the smaller font size %
\end{axis}
\end{tikzpicture}
\caption{Wartezeit}
\end{figure}
\end{document}