Beamer : modification de l'espace au-dessus du bandeau du titre

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\documentclass[french,9pt]{beamer}
\usetheme{JuanLesPins}
\setbeamercovered{transparent}
\definecolor{bleuklein}{rgb}{0.30,0.10,0.95}
\definecolor{vertolive}{cmyk}{1.0,1.0,0.0,0.15}
\definecolor{bleuturquoise}{cmyk}{1.0,0.3,0.0,0.15}
\definecolor{Firebrick3}{rgb}{0.804,0.150,0.150}
\usecolortheme[named=bleuturquoise]{structure}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[french]{babel}
\setbeamersize{text margin left = 2mm, % normalement c'est 1 cm
    text margin right = 2mm, % normalement c'est 1 cm
}
%\usepackage{color}
%\usepackage{xcolor}
% \usepackage[dvipsnames,svgnames]{xcolor}
\usepackage{pgf}
\usepackage{tikz}
%\usepackage{graphicx}
%\DeclareGraphicsExtensions{.jpg,.pdf,.png}
%\usepackage{caption}
%\usepackage{amssymb}
%\usepackage{amsmath}
%\usepackage{amsfonts}
%\usepackage{url}
%\usepackage{setspace}
\usepackage{gensymb}
\usepackage{mathrsfs}
\usepackage{chemfig}
\usepackage{pgfplots}
\usepackage{siunitx}
\usepackage{booktabs}
\usepackage{tabularx}
\usepackage{array}
\usepackage{ragged2e, makecell, mhchem}
%\usepackage{fancyhdr}
%\pagestyle{fancy}
 
 
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