+latex_preamble = r'''
+\usepackage{epigraph}
+\usepackage[final]{varioref} % XXX: breaks PDF index, use [final] when done
+\usepackage{subfig}
+% Relaja restricciones de LaTeX para floats, ver:
+% http://mintaka.sdsu.edu/GF/bibliog/latex/floats.html
+% http://www.tex.ac.uk/cgi-bin/texfaq2html?label=floats
+\renewcommand{\topfraction}{.7}
+\renewcommand{\bottomfraction}{.7}
+\renewcommand{\textfraction}{.05}
+\renewcommand{\floatpagefraction}{.7}
+\setcounter{topnumber}{1}
+\setcounter{bottomnumber}{1}
+\setcounter{totalnumber}{4}
+% Profundida maxima de tabla de contenidos
+\setcounter{tocdepth}{2}
+'''