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+% document
+\documentclass[11pt]{article}
+\usepackage[letterpaper, portrait, margin=0.75in]{geometry}
+\usepackage{setspace}
+\usepackage{color}
+
+% text
+\usepackage[utf8]{inputenc}
+\setlength\parindent{0pt}
+\setlength{\parskip}{1em}
+\usepackage{enumitem}
+\renewcommand{\familydefault}{\sfdefault}
+\newcommand{\RomanNumeral}[1]{\textrm{\uppercase\expandafter{\romannumeral #1\relax}}}
+
+% math
+\usepackage{amssymb}
+\usepackage{amsmath}
+\usepackage[cm]{sfmath}
+\usepackage{commath}
+\usepackage{multirow}
+\DeclareMathAlphabet{\mathpzc}{OT1}{pzc}{m}{it}
+
+% graphics
+\usepackage{graphics}
+\usepackage{graphicx}
+\usepackage{epsfig}
+\usepackage{epstopdf}
+\usepackage{xpatch}
+\usepackage{pdfpages}
+
+% "S" prefix
+\renewcommand{\theequation}{S\arabic{equation}}
+\renewcommand{\thefigure}{S\arabic{figure}}
+\renewcommand{\thetable}{S\arabic{table}}
+
+% each section begins new page
+\let\stdsection\section
+\renewcommand\section{\clearpage\stdsection}
+
+% hyperref
+\usepackage{hyperref}
+\hypersetup{
+	colorlinks,
+	bookmarksopen,
+	bookmarksnumbered,
+	hidelinks,
+}
+\usepackage[all]{hypcap}  % helps hyperref work properly
+
+% bibliography
+\usepackage[numbers]{natbib}
+
+\begin{document}
+\setcounter{page}{1}
+\renewcommand{\thepage}{S\arabic{page}}
+
+\begin{center}
+	\LARGE
+
+        Supporting Information
+
+        Open Source Photoreactor
+
+	\normalsize
+
+	\textit{Philip Lampkin, Blaise J. Thompson, and Samuel H. Gellman*}
+
+	Department of Chemistry, University of Wisconsin--Madison\\
+	1101 University Ave., Madison, Wisconsin 53706
+\end{center}
+
+\vspace{\fill}
+
+*Corresponding Author \\
+\hspace*{2ex} email: gellman@chem.wisc.edu \\
+
+\pagebreak
+\renewcommand{\baselinestretch}{0.75}\normalsize
+\tableofcontents
+\renewcommand{\baselinestretch}{1.0}\normalsize
+\pagebreak
+
+\section{Introduction}
+
+\section{Electronics}
+
+\subsection{Analog}
+
+\includepdf[landscape=true]{"../analog-driver/driver.pdf"}
+
+\subsection{Digital}
+
+TODO: document I2C connection choice.
+Consistent with Adafruit, Sparkfun, Seeed...
+
+\subsubsection{Driver}
+
+\includepdf[landscape=true]{"../digital-driver/driver.pdf"}
+
+\subsubsection{Controller}
+
+\clearpage
+\section{Mechanical Construction}
+
+0.5'' standoff: RAF 4505-440-AL
+
+\subsection{Base}
+
+\subsubsection{LED and Heatsink}
+
+TODO: LED PCB part number
+
+TODO: heatsink part number
+
+\begin{figure}
+  \centering
+  \includegraphics[width=\textwidth/2]{"../pictures/tap-heatsink.jpg"}
+  \caption{Two of the innermost holes on the extruded heatsink must be 4-40 tapped.}
+\end{figure}
+
+Tap the heatsink.
+We used thread-forming tap: OSG 1400105300.
+
+TODO: heatsink compoud
+
+Install with wires facing towards printed hole
+
+Use 4-40 1/4''.
+
+\subsubsection{Fan}
+
+TODO: fan part number
+
+Noctua NF-A12x15 PWM
+
+pins:
+blue: PWM (5 V)
+yellow: +12 V
+black: ground
+
+Use 4-40 3/4'' into captured nuts
+
+\section{Efficacy}
+
+\end{document}