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name=plot2a,
at=(plot2.below south east), anchor=above north east, xshift=1cm,
axis lines*=middle,
enlargelimits = upper, clip=true,
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axis lines*=middle,
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scale only axis,
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xtick={0, 0.25, 0.5, 0.75, 1},
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every outer y axis line/.append style={white!15!black},
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