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+\documentclass[11pt,a4paper]{article}
+\usepackage{fontspec}
+\usepackage{unicode-math}
+\usepackage{libertineotf}
+\usepackage{tikz}
+\usepackage{csquotes}
+\newcommand{\package}[1]{\emph{#1}}
+\begin{document}
+\title{Page layout with \package{reledpar}}
+\author{Domenico Cufalo and Maïeul Rouquette}
+\date{August 17, 2017}
+\maketitle
+\begin{figure}[p]\centering
+\begin{tikzpicture}[every node/.style={anchor=above,font=\scriptsize}]
+ \draw (0,0) rectangle (6,8);
+ \draw (-1.5,-1.5) rectangle (7.5,9.5);
+ \draw (0.5,1) rectangle (2.5,5);
+ \draw (3.5,1) rectangle (5.5,5);
+ \draw[blue,thick,|<->|] (0,8.5) -- node[above] {textwidth ($T$)} (6,8.5);
+ \draw[blue,thick,<->] (-1.5,7) -- node[above] {$Lmargin$} (0,7);
+ \draw[blue,thick,<->] (0,7) -- node[above] {numb. text width ($N$)} (6,7);
+ \draw[blue,thick,<->] (6,7) -- node[above] {$Rmargin$} (7.5,7);
+ \draw[blue,thick,|<->|] (0.5,6) -- node[above] {$widthliketwocolumns$} (5.5,6);
+ \draw[red] (3,1) -- (3,5) node[above] {colsep ($S$)};
+ \draw[blue,thick,<->] (0,3) -- node[above] {$LM$} (0.5,3);
+ \draw[blue,thick,<->] (0.5,3) -- node[above] {$L$} (2.5,3);
+ \draw[blue,thick,<->] (2.5,3) -- node[above] {$B$} (3,3);
+ \draw[blue,thick,<->] (3,3) -- node[above] {$A$} (3.5,3);
+ \draw[blue,thick,<->] (3.5,3) -- node[above] {$R$} (5.5,3);
+ \draw[blue,thick,<->] (5.5,3) -- node[above] {$RM$} (6,3);
+\end{tikzpicture}
+\caption{Page layout}\label{pic:page}
+\end{figure}
+\section{General}
+\package{Reledmac} doesn't care neither text width ($T$) nor margins, whose sizes are calculated by \LaTeX{} itself or depends on other packages like \package{geometry}. In normal typesetting, line numbers and sidenotes are in the margin.
+
+In parallel typesetting, sidenotes and lines numbers can be, or not, in page margins.
+
+Normally, we get:
+
+\begin{equation}
+ T = LM + L + B + S + A + R + RM
+\end{equation}
+
+The only possible exceptions occur when the user makes mistakes when fixing $L$ and / or $A$ and / or $B$ and / or $R$.
+\section{Parameters}
+The parameters that can be controlled by \package{reledmac} are (see fig.~\ref{pic:page}):
+
+\begin{description}
+ \item[N] The numbered text width, \emph{i. e.} the width of text which is between \verb+\beginnumbering+ and \verb+\endnumbering+ in normal tyepsetting. By default $N=T$, but can be also modified by the \package{reledmac}/\package{reledpar} option \verb!widthliketwocolumns!: in this case, $N=L+B+S+A+R$
+
+ \item[L] \verb!\Lcolwidth!; fixed width, by default \verb!{0.45\textwidth}!
+
+ \item[R] \verb!\Rcolwidth!; fixed width, by default \verb!{0.45\textwidth}!
+
+ \item[S] \verb!\columnseparator!; \package{reledpar} inserts a vertical rule of width \verb!\columnrulewidth!, by default set to be $0\,pt$. You can redefine \verb!\columnrulewidth! by
+
+\begin{verbatim}
+ \setlength{\columnrulewidth}{0.4pt}
+\end{verbatim}
+
+ \item[B] \verb!\beforecolumnseparator!: automatically calculated, but can be redefined by
+
+\begin{verbatim}
+ \setlength{\beforecolumnseparator}{<length>}
+\end{verbatim}
+
+ \item[A] \verb!\aftercolumnseparator!: automatically calculated, but can be redefined by
+
+\begin{verbatim}
+ \setlength{\aftercolumnseparator}{<length>}
+\end{verbatim}
+
+\end{description}
+
+\section{Columns' position}
+By default, columns are positioned to the right of the page. However, you can use
+\verb!\columnsposition{L}! to align them to the left, or \verb!\columnsposition{C}! to center
+them.
+
+In this case $LM$ and $RM$ are modified:
+
+\begin{itemize}
+ \item with \verb!\columnsposition{L}!, $LM=0$ and $RM$ is automatically calculated;
+ \item with \verb!\columnsposition{R}!, $RM=0$ and $LM$ is automatically calculated;
+ \item with \verb!\columnsposition{C}!, $RM$ and $LM$ are automatically calculated.
+\end{itemize}
+
+\section{Automatically calculated parameters}
+Therefore, the lengths automatically calculated are $LM$, $RM$, and, if not fixed by user, $B$ and $A$.
+
+
+\subsection{If $LM$, $RM$, $B$ and $A$ are calculated}
+\begin{equation}
+ LM = RM = B = A = \frac{T - (L + S + R)}{4}
+\end{equation}
+
+\subsection{If $LM$, $RM$, $B$ are calculated}
+
+\begin{equation}
+ LM = RM = B = \frac{T - (L + A + S + R)}{3}
+\end{equation}
+
+\subsection{If $LM$, $RM$, $A$ are calculated}
+
+\begin{equation}
+ LM = RM = A = \frac{T - (L + B + S + R)}{3}
+\end{equation}
+\subsection{If only $LM$ and $RM$ are calculated}
+
+\begin{equation}
+ LM = RM = \frac{T - (L + B + S + A + R)}{2}
+\end{equation}
+
+\subsection{In any case}
+$LM$, $B$, $A$, $RM$ can't have a negative value. If the result of one the previous equation is negative, then that means the value equals $0$.
+
+Technically, the \enquote{calculated values} are determined using \verb+\hfill+.
+
+\end{document}