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\usepackage{overpic}
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%********************
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%* Graphic callouts *
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%********************
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% Where to put the <co> in the graphic
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\newdimen\picfactorx
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\newdimen\picfactory
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\newdimen\picx
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\newdimen\picy
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% Evaluates the percent factors for x and y dimensions. The principle is that
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% overpic gives a 100% for the biggest length (width or height).
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% The coordonates given to \calspair being in percentage of the graphic
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% dimension itself, the picfactors translate them to overpic percentages.
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%
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% Variables set by overpic:
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% \@tempcnta = width
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% \@tempcntb = height
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\def\picfactoreval{%
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\ifnum\@tempcnta>\@tempcntb%
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\picfactorx=1pt%
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\picfactory=\@tempcntb pt%
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\divide\picfactory by \@tempcnta%
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\else%
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\picfactory=1pt%
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\picfactorx=\@tempcnta pt%
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\divide\picfactorx by \@tempcntb%
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\fi%
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}
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\newcommand{\calspair}[3]{
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\sbox{\z@}{#3}%
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\picx=#1\picfactorx%
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\picy=#2\picfactory%
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\put(\strip@pt\picx,\strip@pt\picy){\makebox(0,0){\usebox{\z@}}}
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}
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%*********************
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%* Verbatim callouts *
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%*********************
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% Counters for cross-referencing callouts
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\newcounter{cocnt}
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\newcounter{colref}
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% How to represent the <co> markup.
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% Big thanks to Jean-Côme Charpentier for his help.
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%
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\newlength{\co@width}
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\newlength{\co@height}
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\newlength{\balldiam}
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\newlength{\ballcentre}
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\def\conum#1{%
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\sbox{\z@}{\color{white}\sffamily\bfseries\tiny#1}%
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% Box sizes for any number with two digits
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\sbox{\@ne}{\color{white}\sffamily\bfseries\tiny00}%
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\settowidth{\co@width}{\usebox{\@ne}}%
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\settoheight{\co@height}{\usebox{\@ne}}%
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% Find out the biggest length, to define the circle diameter
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\ifnum\co@width>\co@height
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\setlength{\balldiam}{\co@width}%
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\else
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\setlength{\balldiam}{\co@height}%
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\fi
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\balldiam=1.45\balldiam
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\ballcentre=0.5\balldiam
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\setlength{\unitlength}{1pt}% In the case it has been changed
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\begin{picture}(\strip@pt\balldiam,\strip@pt\balldiam) %
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\put(\strip@pt\ballcentre,\strip@pt\ballcentre){\circle*{\strip@pt\balldiam}}
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\put(\strip@pt\ballcentre,\strip@pt\ballcentre){\makebox(0,0){\usebox{\z@}}}
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\end{picture}%
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}
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% How to represent a <co> embedded in a listing
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\def\co#1{\refstepcounter{cocnt}\conum{#1}}
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% Make the <co> text and the label to link to
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\def\coref#1#2{\co{#1}\label{#2}}
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% Make only the <co> label to link to
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\def\colabel#1{\refstepcounter{cocnt}\label{#1}}
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% Make the <callout> label to link to
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\def\collabel#1{\refstepcounter{colref}\label{#1}}
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