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The babel patch for two columns you mentioned got bugs and it is about when you use geometry class lets say \usepackage[left=2cm,right=2cm]{geometry} it does not set the right and left margins correctly. I fixed that in xepersian and I believe the perfect code should be<br><br>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%<br>\def\RTL@outputdblcol{\if@firstcolumn<br>\global\@firstcolumnfalse<br> \global\setbox\@leftcolumn\box\@outputbox<br> \else \global\@firstcolumntrue<br> \setbox\@outputbox\vbox{%<br> \hbox to\textwidth{%<br> \hbox to\columnwidth{\box\@outputbox \hss}%<br> \hfil \vrule width\columnseprule\hfil<br> \hbox to\columnwidth{\box\@leftcolumn \hss}%<br> }}\@combinedblfloats<br>\@outputpage \begingroup \@dblfloatplacement<br>\@startdblcolumn<br>\@whilesw\if@fcolmade \fi<br>{\@outputpage\@startdblcolumn}\endgroup<br> \fi}<br>\def\LTR@outputdblcol{\if@firstcolumn<br>\global\@firstcolumnfalse<br> \global\setbox\@leftcolumn\box\@outputbox<br> \else \global\@firstcolumntrue<br> \setbox\@outputbox\vbox{\hbox to\textwidth{%<br> \hbox to\columnwidth<br> {\box\@leftcolumn \hss}\hfil<br> \vrule width\columnseprule\hfil<br> \hbox to\columnwidth{\box\@outputbox \hss}}}%<br> \@combinedblfloats<br> \@outputpage \begingroup \@dblfloatplacement<br> \@startdblcolumn<br> \@whilesw\if@fcolmade \fi<br> {\@outputpage\@startdblcolumn}\endgroup<br> \fi}<br>\newcommand{\RTLdblcol}{\renewcommand{\@outputdblcol}{\RTL@outputdblcol}}<br>\newcommand{\LTRdblcol}{\renewcommand{\@outputdblcol}{\LTR@outputdblcol}}<br>\RTLdblcol<br>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%<br><br>I reported \underline bug and others a while ago and you can look at them in the arcive namely<br><br>http://tug.org/mailman/htdig/xetex/2008-December/011359.html<br><br><br>If you really want perfect bidi support, then have a look at xepersian.sty<br><div><div><pre><br></pre></div></div>
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