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\usepackage{tikz}
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%\usepackage{pgf}
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%\usetikzlibrary{positioning}
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%\usetikzlibrary{calc}
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%\usetikzlibrary{automata}
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%\usetikzlibrary{arrows}
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%\usetikzlibrary{backgrounds}
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%\usetikzlibrary{fit}
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%\usepackage{tikz-qtree}
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\usepackage{pgfplots}
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%\pgfplotsset{compat=1.15}