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Its just as the title sys.

Thanks.

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Some details could be helpful. I understand »sections« as headings thus a part of the document structure. Perhaps you mean the place between two paragraphs. –  Thorsten Donig Oct 13 '10 at 10:11
    
@Thorsten: Yes, you are right. I changed the title. –  Neves Oct 13 '10 at 10:36
1  
Also see: How do I insert a border below text? –  Werner Dec 8 '11 at 18:47

4 Answers 4

up vote 5 down vote accepted

In ConTeXt, \blackrule gives a horizontal line. By default, the width of the line 1em wide and 1ex tall. The width, height, and depth are changed using the respective options. For example:

\blackrule[width=\hsize, height=1pt, depth=0.5ex]
  • Despite its name, \blackrule also draws colored rules.

    \blackrule[color=red]
    
  • \setupblackrules specifies the options for all \blackrules.

  • As a bonus, \blackrules (notice the plural) draws multiple horizontal rules. For example:

    \blackrules[n=6, width=\hsize, distance=0.5ex]
    

    draws 6 rules separated by a distance of 0.5ex.

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I think that everyone would agree that this is now the best answer. –  Neves Oct 14 '10 at 3:42

How does this look:

alt text

Whilst I generally favour TikZ for anything vaguely graphical, this was achieved with a simple \rule:

\documentclass{article}
\thispagestyle{empty}
\usepackage{lipsum}

\begin{document}

\lipsum[1]

\noindent\rule[0.5ex]{\linewidth}{1pt}

\lipsum[2]

\end{document}

You can thicken the line by changing the 1pt to something else (or make it thinner, I guess). Perhaps style purists would want to change the before and after spacing a little.

(Added in edit: in the comments, Style Purist Will recommends adding a little height, and as it's so easy to do - I'd forgotten about the optional argument, myself - I thought it worth adding in the demonstration. He also used \linewidth rather than \textwidth - my original choice - which is a little more robust as it will vary correctly in lists and other environments where the linewidth can get altered.)

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@Andrew: Very nice. Just what I needed. Thanks. –  Neves Oct 13 '10 at 11:03
    
I'd recommend raising that rule a little with something like \rule[0.5ex]{\linewidth}{1pt}. I guess that makes me a style purist, whatever that is ;) –  Will Robertson Oct 13 '10 at 12:54
    
@Andrew: you'd have gotten hella downvotes if you actually had written up a TiKZ answer. =) –  Willie Wong Oct 13 '10 at 14:06
5  
It embarasses you on stackexchange when it's too late to edit your post to fix your dumb typo, that's what it does. ;) –  frabjous Oct 13 '10 at 23:54
3  
Needing the \noindent with \rule seems strange. I wonder why it wasn't written to just work in either h mode or v mode. Looking at the definition of \@rule, it'd be a trivial modification: remove \leavevmode\hbox and replace \vrule with \ifvmode\hrule\else\vrule\fi –  TH. Oct 14 '10 at 9:10

This is more for myself, but I just used \hrule where I was trying to use \hline in text mode a document, since of course a line is never as simple as just a line. That's LaTeX.

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I typically use \hrulefill or \noindent\hrulefill to achieve a horizontal line.

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