\documentclass[tikz,border=5pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
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\begin{document}
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\begin{axis}[
name = third plot,
width=200pt,height=99pt,
tick pos=both,
xlabel={Relative accuracy},
xmin=-1, xmax=1,
bar width=3.33333334ex,
xtick style={color=black},
y grid style={darkgray176},
ylabel={Rel. occurence},
ymin=0, ymax=0.65,
ytick style={color=black},
legend style={at={(0.9875, 0.95)}, anchor=north east},
area legend
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\end{axis}
\begin{axis}[
name = second plot,
width=200pt,height=99pt,
xshift=182pt,
tick pos=both,
bar width=1.66666667ex,
xlabel={Relative accuracy},
xmin=-1, xmax=1,
y grid style={darkgray176},
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ytick style={color=black}
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\begin{axis}[
name = first plot,
width=200pt,height=99pt,
xshift=364pt,
tick pos=both,
xmin=-1, xmax=1,
y grid style={darkgray176},
xlabel={Relative accuracy},
ymin=0, ymax=0.25,
bar width=0.833333333ex,
ytick style={color=black},
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--(axis cs:0,1);
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\addlegendentry{$Q_{3/3}(\bar{\textnormal{H}})$}
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\end{tikzpicture}
\end{document}