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 img { padding-bottom: 20px; padding-top: 20px; } span.TEX {letter-spacing: -0.125em;padding-right:0.35ex;} span.TEX span.E{ position:relative;top:0.5ex;left:-0.0417em;} a span.TEX span.E {text-decoration: none; } span.LATEX span.A{ position:relative; top:-0.5ex; left:-0.4em; font-size:75%;} span.LATEX span.TEX{ position:relative; left: -0.4em;} \overfullrule[=] dimension Where: “[=]” means that the equals sign is optional. dimension is an amount specified in units that TEX can understand—e.g., pt, bp, mm etc. When TEX detects that an hbox is overfull—such as a line in a typeset paragraph or some text in an \hbox{..}—it will write that information to the log file. In addition, TEX engines also provide the \overfullrule command which can be used to instruct TEX to add a short rule to the end of the offending box, acting as a visual warning to the user. Usage example Because the “=” sign is optional you can write \overfullrule=10pt or \overfullrule 10pt. Note that LATEXsets \overfullrule to 0pt, Plain TEX sets it to 5pt. An example We’ll use an \hbox{} that will be overfull: \hbox to 10pt{This box will be overfull} and set \overfullrule to a non-zero value, say 10mm: \overfullrule=10mm\hbox to 10pt{This box will be overfull}\par The following graphic shows the output: As you can see, a 10mm-long rule has been added to the end of the overfull \hbox. Now set \overfullrule=0mm to prevent an overfull box rule being displayed: \overfullrule=0mm\hbox to 10pt{This box will be overfull} The following graphic shows the output: The resulting \hbox is still overfull but this time it is displayed without an overfull rule to highlight that fact. Another example: lines in a paragraph When TEX breaks a pararaph into lines of typeset text, each line in the paragraph is stored in an \hbox. TEX can be told to display overfull lines by setting \overfullrule to a non-zero value. The following example shows overfull rules being displayed at the end of overfull lines in a paragraph. To create a paragraph, we’ll put some text in a narrow \vbox, set \overfullrule=10pt, and draw the box with a border. Note that because we used the \verb command we first need to save the \vbox in a box register (100) and then use the LATEX command (macro) \fbox to draw a tight border around it, making it easier to see the overfull lines. \overfullrule=10pt \setlength{\fboxsep}{0pt}% To ensure a tight border with no gap \setbox100=\vbox{\hsize=30mm Inside this vbox we’ll set the linewidth to 30mm using \verb|\hsize=30mm|. We are typesetting some text inside a \verb|\vbox| because it will cause \TeX{} to perform linebreaking and build the paragraph as a stack of horizontal boxes. For some lines \TeX{} might be unable to find a good linebreak which can result in lines too wide to fit within a width of 30mm. Because \verb|\overfullrule| is non-zero (10pt), those overfull lines are indicated by an overfull rule of width 10pt. Note that to \TeX{}, this box is still considered to be 30mm wide even though some lines do not fit and an \verb|\overfullrule| of width 10pt is added on to the end of some lines.} \fbox{\copy100} The following graphic shows the output: