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+% mya4.sty for those who don't have any a4.sty on their engine
+\def\fileversion{1.2}
+\def\filedate{26 Feb 90}
+\def\docdate {26 Feb 90}
+%
+%% \CheckSum{134}
+%% \CharacterTable
+%%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
+%%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+%%   Digits        \0\1\2\3\4\5\6\7\8\9
+%%   Exclamation   \!     Double quote  \"     Hash (number) \#
+%%   Dollar        \$     Percent       \%     Ampersand     \&
+%%   Acute accent  \'     Left paren    \(     Right paren   \)
+%%   Asterisk      \*     Plus          \+     Comma         \,
+%%   Minus         \-     Point         \.     Solidus       \/
+%%   Colon         \:     Semicolon     \;     Less than     \<
+%%   Equals        \=     Greater than  \>     Question mark \?
+%%   Commercial at \@     Left bracket  \[     Backslash     \\
+%%   Right bracket \]     Circumflex    \|     Underscore    \_
+%%   Grave accent  \`     Left brace    \{     Vertical bar  \º
+%%   Right brace   \}     Tilde         \%}
+%%
+%
+%\iffalse
+% Style option `A4' to be used with LaTeX V2.09
+%
+% Please report errors to: J.L. Braams
+%                          JL_Braams@pttrnl.nl (Braams@hlsdnl5.bitnet)
+%                      or: N.A.F.M. Poppelier
+%                          Poppelier@hutruu53.bitnet}
+%
+% \changes{v1.0}{10 Jan 90}{Changed the margins for one-sided printing}
+% \changes{v1.1}{23 Jan 90}{Added \WideMargins macros}
+% \changes{v1.2}{26 Feb 90}{Consolidated setting of \marginparwidth}
+%
+%\fi
+%
+% \title{A style option to adapt the standard \LaTeX\ document
+%        styles to A4 paper\thanks{This file
+%        has version number \fileversion --
+%        last revision \filedate, documentation dated \docdate.}}
+%
+% \author{Nico Poppelier}
+% \address{\TeX nique         \\
+%          Washingtondreef 153\\
+%          3564 KD Utrecht}
+% \netaddress{Poppelier@hutruu53.bitnet}
+% \author{Johannes Braams}
+% \address{PTT Research Neher Laboratories\\
+%          P.O. Box 421\\
+%          2260 AK Leidschendam}
+% \netaddress{JL_Braams@pttrnl.nl}
+%
+% \date{Printed \today}
+%
+% \maketitle
+%
+% \begin{abstract}
+%   This article describes a new style option that can be used with the
+%   document styles that are distributed with the \LaTeX\ distributions.
+%   It modifies the page layout to conform to the paper format most
+%   commonly used in Europe, portrait A4.
+% \end{abstract}
+%
+% \section{Introduction}
+%
+% This file is based on the document style options \verb+A4.sty+ and
+% \verb+A4wide.sty+, which can be found in the Rochester style archive.
+% The original style option \verb+A4.sty+ we started from was written by
+% John Pavel, and is dated May 1987. This option only changes the vertical
+% size of the text somewhat, by increasing the number of lines on a page.
+% The style option \verb+A4wide.sty+ was written by Jean-Francois Lamy,
+% and is dated July 1986. This option only increases the width of the text.
+%
+% \section{Goals and design decisions}
+%
+% As many people before us, we found the page layout as implemented in the
+% standard \LaTeX\ document styles too much geared towards the
+% American-sized paper, which is somewhat wider than A4 paper, but also
+% noticeably less high.
+%
+% Our goal was to get a page layout that was suitable for A4 paper, and
+% produced legible texts. There are a number of layout parameters that
+% influence the legibility of a text. A parameter of major importance is
+% the number of words (or characters) on a line. The maximum number of
+% words per line is ten to twelve for optimal legibility, a rule-of-thumb
+% that can be found in typographic literature (we used%\cite{treebus}).
+% This results in a number of characters per line which lies somewhere
+% between sixty and seventy.
+%
+% Another important parameter is the amount of white space surrounding the
+% text. Here we have to distinguish between texts that are printed
+% one-sided and texts that are printed two-sided (back to back). In the
+% first case the margins on odd and even pages should be equal; in the
+% latter case care should be taken that the texts on both sides of the
+% paper overlap.
+% Also a printed document is likely to be bound some way or another, so
+% there should be enough white space in the `inner' margin\footnote{For
+% two-sided printing, this is the left margin on odd-numbered pages and the
+% right margin on even-numbered ones; for one-sided printing, this is
+% always the left margin.} of the text to allow this.
+%
+% There is yet one more thing to take into account when designing a page
+% layout. \LaTeX\ offers the possibility of using marginal notes and if
+% someone wants to use marginal notes, they should of course fit on
+% the paper.
+%
+% So, we have the following goals:
+% \begin{enumerate}
+% \item Choose the text width such that there will be sixty to seventy
+%       characters on a line;
+% \item See to it that in documents that are printed two-sided, the
+%       texts which end up on two sides of one sheet of paper overlap;
+% \item Leave enough white space in the `inner' margin to allow for
+%       the binding of the document;
+% \item Leave enough white space in the `outer' margin
+%       for marginal notes if they are going to be used.
+% \end{enumerate}
+%
+%
+% \section{The implementation}
+%
+% \subsection{The starting point}
+%
+% Thus we set out to modify some of the design decisions in the standard
+% document styles. Because we knew that we were not the first to tackle
+% the problem, we started by having a look at what was already available.
+% We came up with the two options mentioned earlier, which are publicly
+% available. Undoubtedly there will exist many more such files, some of
+% them maybe modifications of those two files.
+%
+% We had a look at the layout produced by both options and were not
+% satisfied with it. For one thing, both of the original options \verb+A4+
+% and \verb+A4wide+ modify only one aspect of the page layout. The first
+% thing to do was to put these two files together. This resulted in a
+% layout which was still unsatisfactory, since for the 10-point and
+% 11-point options lines in the text contained on the average eighty
+% characters or more.
+%
+% \subsection{What else?}
+%
+% \DescribeMacro\textwidth
+% \DescribeMacro\marginparwidth
+% Because the result so far gave us lines that contained too many
+% characters, we decreased the \verb+\textwidth+ to get lines that
+% contain about sixty to seventy characters for all three size options.
+% Still more work had to be done. As it turned out, using our new
+% \verb+A4.sty+ together with the option \verb+twosided+ had a drawback:
+% when the document was printed two-sided the texts on both side of one
+% piece of paper overlapped only partly, which does not look good. We
+% solved this by modifying the width of the margins for two-sided
+% printing. At the same time we modified the \verb+\marginparwidth+ so
+% that if someone uses a marginal note it would completely fit on the
+% paper instead of falling off the page, which obviously would render
+% the note unreadable.
+%
+% \DescribeMacro\WideMargins
+% The decisions described above allow for marginal notes to be printed
+% along with the normal text, but if someone makes heavy use of marginal
+% notes, the resultant layout will not be very satisfactory, because if
+% the full width of the marginal notes is used, they will take up too
+% much space in the `outer' margin. For this case we provide the macro
+% \verb+\WideMargins+. This macro modifies the page-layout parameters in
+% such a way that the width reserved for marginal notes becomes 1.5
+% inches. To achieve this the width of the main body of the text is
+% decreased. This macro is meant to be used only in the preamble of the
+% document.
+%
+%\StopEventually{
+% \section{Conclusion}
+%
+% We have presented a new approach to adapt the page layout of the
+% document styles that are part of the standard \LaTeX\ distributions to
+% the dimensions of A4 paper. The width of marginal notes has been taken
+% into account and a means to get wider marginal notes at the cost of
+% shorter lines in the main body of the text has been provided.
+%
+% \begin{thebibliography}{9}
+%   \bibitem{treebus} K.F. Treebus.
+%   {\em Tekstwijzer, een gids voor het grafisch verwerken van tekst.}
+%   SDU Uitgeverij ('s-Gravenhage, 1988). A Dutch book on layout
+%   design and typography.
+% \end{thebibliography}
+%
+% \makesignature
+% }
+%
+% \subsection{The code}
+%
+% We begin by identifying the version of this file on the terminal and
+% in the transcript file.
+%    \begin{macrocode}
+\typeout{Style option `A4' \fileversion\space<\filedate> (NP and JLB)}
+% \typeout{English documentation\space\space\space<\docdate> (JLB)}
+%    \end{macrocode}
+%
+% \begin{macro}{\topmargin}
+% First, we redefine the \verb+\textheight+ and \verb+\topmargin+. The
+% \verb+\topmargin+ is the distance from the reference point on the page
+% to the top of the page of text. In most cases extra white space is not
+% necessary since one inch of white space at the top of the page suffices.
+%    \begin{macrocode}
+\topmargin 0pt
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\textheight}
+% The dimension parameter \verb+\textheight+ gives the total height of the
+% text, including footnotes and figures, excluding the running head and
+% foot. This height is given as an integral number times the
+% \verb+\baselineskip+, which results in an integral number of lines on a
+% page.
+%
+% \noindent
+% We have to include definitions of all relevant dimension parameters for
+% each of the cases 10-point, 11-point and 12-point. We do this with a
+% case statement:
+%
+%    \begin{macrocode}
+\ifcase \@ptsize
+    \textheight 53\baselineskip
+%    \end{macrocode}
+% \noindent
+% which modifies the height of the text for texts to be produced
+% with the ten-point typeface:
+%    \begin{macrocode}
+\or
+    \textheight 46\baselineskip
+%    \end{macrocode}
+% \noindent
+% the same for eleven point:
+%    \begin{macrocode}
+\or
+    \textheight 42\baselineskip
+%    \end{macrocode}
+% \noindent
+% and for twelve point. Finally we close the \verb+\ifcase+ statement:
+%    \begin{macrocode}
+\fi
+%    \end{macrocode}
+%
+% \noindent
+% The only thing left to be done is to add the \verb+\topskip+ to
+% the \verb+\textheight+.
+% The value of \verb+\topskip+ appears always to be 10pt.
+%
+%    \begin{macrocode}
+\advance\textheight by \topskip
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\textwidth}
+% \begin{macro}{\oddsidemargin}
+% \begin{macro}{\evensidemargin}
+% That was the `vertical part' of the work. Now we have some work to do
+% to get things right horizontally. Again we have to distinguish between
+% the various character sizes because sixty eleven-point characters take
+% up more space than sixty ten-point characters. But there's more to
+% take into account. If documents are printed two-sided, the texts on
+% both sides of the paper should overlap completely. This can be done be
+% assigning appropriate values to \verb+\oddsidemargin+ and
+% \verb+\evensidemargin+, the parameters that define the left margins on
+% odd and even pages respectively.
+%
+% \noindent
+% First we start a case statement to distinguish between the various
+% typeface sizes.
+%    \begin{macrocode}
+\ifcase \@ptsize
+%    \end{macrocode}
+% Then we specify the width of the text.
+%    \begin{macrocode}
+    \textwidth      5.00in
+%    \end{macrocode}
+% \noindent
+% Also specify the width of marginal notes. They must have a
+% reasonable width to be of any use, and this should be the same for
+% either one-sided or two-sided printing.
+%    \begin{macrocode}
+    \marginparwidth 1.00in
+%    \end{macrocode}
+% \noindent
+% Here we need an if statement to test whether the option \verb+twosided+
+% has been specified.
+%    \begin{macrocode}
+  \if@twoside
+%    \end{macrocode}
+% \noindent
+% If it was, assign appropriate values to the margin parameters
+%    \begin{macrocode}
+    \oddsidemargin  0.55in
+    \evensidemargin 0.75in
+  \else
+%    \end{macrocode}
+% \noindent
+% If the option \verb+twosided+ was not used, both margin parameters
+% must have the same value, for texts on consecutive pages have to
+% be put in the same place on the paper.
+%    \begin{macrocode}
+    \oddsidemargin  0.55in
+    \evensidemargin 0.55in
+%    \end{macrocode}
+% \noindent
+% Now we close the if statement.
+%    \begin{macrocode}
+  \fi
+%    \end{macrocode}
+% \noindent
+% We are ready with the modifications for the ten-point typeface size, so
+% now we do something similar for the eleven-point typeface.
+%    \begin{macrocode}
+\or
+    \textwidth      5.20in
+    \marginparwidth 1.00in
+  \if@twoside
+    \oddsidemargin  0.45in
+    \evensidemargin 0.65in
+  \else
+    \oddsidemargin  0.45in
+    \evensidemargin 0.45in
+  \fi
+%    \end{macrocode}
+% \noindent
+% One more time, now for the twelve-point typeface.
+%    \begin{macrocode}
+\or
+    \textwidth      5.70in
+    \marginparwidth 0.80in
+  \if@twoside
+    \oddsidemargin  0.20in
+    \evensidemargin 0.40in
+  \else
+    \oddsidemargin  0.20in
+    \evensidemargin 0.20in
+  \fi
+%    \end{macrocode}
+% \noindent
+% Finally we close the case statement.
+%    \begin{macrocode}
+\fi
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\WideMargins}
+%    This macro is somewhat tricky: it has to find out
+%    which typeface size is used, whether the document should be printed
+%    two-sided, and whether the \verb+\reversemarginpar+ is in effect.
+%    \verb+\reversemarginpar+ makes the marginal notes appear in the
+%    margin on the opposite side of the normal placement.
+%    \begin{macrocode}
+\def\WideMargins{%
+%    \end{macrocode}
+% \noindent
+%    Because for each typeface size the changes to the parameters that
+%    need to be made are similar, the macro \verb+\WideMargins+
+%    uses an internal macro \verb+\@widemargins+.
+%
+% \begin{macro}{\ExtraWidth}
+%    In order to store the amount of extra width needed for the marginal
+%    notes an extra dimension parameter is defined.
+%
+%    \begin{macrocode}
+  \newdimen\ExtraWidth
+%    \end{macrocode}
+% \end{macro}
+%
+% \noindent
+%    First find out about the point size, then call \verb+\@widemargins+ to
+%    modify the margin widths by the amount given in \verb+\ExtraWidth+.
+%    \begin{macrocode}
+  \ifcase \@ptsize
+%    \end{macrocode}
+%
+% \noindent
+%    For both 10-point and 11-point texts the width for marginal notes is
+%    already 1 inch, so we increase it by half an inch. We subtract half an
+%    inch from the text width and modify the margins appropriately.
+%
+%    \begin{macrocode}
+    \ExtraWidth = 0.5in
+    \@widemargins
+  \or
+    \ExtraWidth = 0.5in
+    \@widemargins
+  \or
+%    \end{macrocode}
+%
+% \noindent
+%    For 12-point texts the marginal notes are only 0.8 inch wide, so
+%    now we have to add 0.7 inch to get them 1.5 inch wide.
+%
+%    \begin{macrocode}
+    \ExtraWidth = 0.7in
+    \@widemargins
+%    \end{macrocode}
+%
+% \noindent
+%    This macro should only be called once, during the preamble of a
+%    document, so we \verb+\let+ it be equal to \verb+\relax+ as soon
+%    as the work is done.
+%    \begin{macrocode}
+  \fi\let\WideMargins\relax\let\@widemargins\relax}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@preamblecmds}
+%    We add \verb+\WideMargins+ to \verb+\@preamblecmds+, which is a
+%    list of commands to be used only in the preamble of a document.
+%
+%    \begin{macrocode}
+{\def\do{\noexpand\do\noexpand}
+ \xdef\@preamblecmds{\@preamblecmds \do\WideMargins}
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@widemargins}
+%    This macro modifies the margin parameters. To do this it uses
+%    the dimension variable \verb+\ExtraWidth+, which was defined by
+%    \verb+\WideMargins+.
+%
+% \noindent
+%    First the \verb+\ExtraWidth+ is subtracted from the \verb+\textwidth+
+%    and added to the \verb+\marginparwidth+.
+%    \begin{macrocode}
+\def\@widemargins{%
+    \global\advance\textwidth by -\ExtraWidth
+    \global\advance\marginparwidth by \ExtraWidth
+%    \end{macrocode}
+%
+% \noindent
+%    Then we modify the margins, but the value of the switch
+%    \verb+\if@twoside+ has to be taken into account. Because
+%    we have to test another switch (\verb+\if@reversemargin+)
+%    we add another level of macros to modify the margin parameters%
+%
+%    \begin{macrocode}
+    \if@twoside
+      \tw@sidedwidemargins
+    \else
+      \@nesidedwidemargins
+    \fi}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\tw@sidedwidemargins}
+%    Normally the marginal notes are printed in the `outer' margins, so
+%    we have to increase the \verb+\evensidemargin+ to keep the text
+%    balanced on both sides of the paper, but if \verb+\reversemarginpar+
+%    is in effect we have to increase the \verb+\oddsidemargin+ and
+%    decrease the \verb+\evensidemargin+ accordingly.
+%
+%    \begin{macrocode}
+\def\tw@sidedwidemargins{%
+    \if@reversemargin
+%    \end{macrocode}
+%
+% \noindent
+%    Notice that for documents printed two-sided, the
+%    \verb+\evensidemargin+ is wider than the \verb+\oddsidemargin+;
+%    this difference in width is transferred to the other margin.
+%
+%    \begin{macrocode}
+      \@tempdima=\evensidemargin
+      \advance\@tempdima by -\oddsidemargin
+      \advance\oddsidemargin by \ExtraWidth
+      \advance\oddsidemargin by \@tempdima
+      \advance\evensidemargin by -\@tempdima
+    \else
+%    \end{macrocode}
+%
+% \noindent
+%    If the marginal notes go on the normal side of the paper, only the
+%    \verb+\evensidemargin+ has to be increased.
+%
+%    \begin{macrocode}
+      \advance\evensidemargin by \ExtraWidth
+    \fi}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@nesidedwidemargins}
+%    For documents that are printed one-sided, both margins have the same
+%    width. The default placement for the marginal notes is in the right
+%    margin, so if \verb+\reversemarginpar+ is {\em not\/} in effect the
+%    margin parameters need not be modified. If it is in effect, both the
+%    \verb+\oddsidemargin+ and the \verb+\evensidemargin+ need to be
+%    increased.
+%
+%    \begin{macrocode}
+\def\@nesidedwidemargins{%
+    \if@reversemargin
+      \advance\oddsidemargin by \ExtraWidth
+      \advance\evensidemargin by \ExtraWidth
+    \fi}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \Finale
+\endinput