def latex_header() -> str:
    """ Produces a LaTeX header for the fmt_latex_*() functions to use. """

    return (r"""\documentclass[10pt]{article}
\usepackage[a4paper,margin=0.5in,landscape]{geometry}
\usepackage[utf8]{inputenc}
\usepackage{xcolor}"
\usepackage{polyglossia}
\usepackage{booktabs}
\usepackage{longtable}
\setmainfont[Mapping=tex-text,Ligatures=Common,Scale=MatchLowercase]{Doulos SIL}"
\DeclareRobustCommand{hl}[1]{{\textcolor{red}{#1}}}""")