Forcer l'origine d'un graphe

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\documentclass[secnumdepth=subsubsection,12pt,space=onehalf,fncychap=Bjornstrup]{yathesis}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{kpfonts}
\usepackage{booktabs}
\usepackage{siunitx}
\usepackage{pgfplots}
\usepackage{floatrow}
\usepackage{caption}
\usepackage{graphicx}
\usepackage{listings}
\usepackage{microtype}
\usepackage{varioref}
\usepackage{array}
\usepackage{xcolor}
\begin{document}
\begin{figure}[ht]
    \begin{center}   
        \pgfplotsset{%
            every axis legend/.append style = {
                at = {(0.5,1.03)},
                anchor = south
        }}
        {
            \begin{tikzpicture}
            \begin{axis}[
            xlabel=Temps (min),
            ylabel=pourcentage molaire (\%),
            grid=major,width=12cm,
            height=7cm]
            \addplot+[smooth] table {tableaux/cat1-1.txt};
            \addplot+[smooth] table {tableaux/cat1-2.txt};
            \addplot+[smooth,color=green] table {tableaux/cat1-3.txt};
            \legend{A,B,C}
            \end{axis}
            \end{tikzpicture}
        }
    \end{center}
    \caption{Suivi}
    \label{hydrostyr}
 
 
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