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++-----------------------------------------------------------------------------+
+| underscore |
++-----------------------------------------------------------------------------+
+
+Abbreviation: ã|\usã%
+
+Parameters: ã|textã%
+
+ ã|Description:ã%
+Underscoring, drawing a line under words or sentences, is also used for
+emphasis and to indicate book titles.
+
+ ã|Example:ã%
+
+Figure 1 shows a schema borrowed from my previous
+book, \us{The} \us{Intact} \us{Societies:}
+\us{Vestals} \us{and} \us{Volcanos}
+\us{in} \us{the} \us{South Pacific}, which suggests . . .
+ff
++-----------------------------------------------------------------------------+
+| |
+| Figure 1 shows a schema borrowed from my previous book, The Intact |
+| Societies: Vestals and Volcanos in the South Pacific, which suggests |
+| . . . |
+| |
++-----------------------------------------------------------------------------+
+
+ ã|Notes:ã%
+In proportional spacing, the \underscore markup has the occasional
+disadvantage of preventing hyphenation and line breaking, which can result
+in awkward or impossible interword spacing and line breaks. To remedy this,
+put each word to be underscored inside of its own \underscore markup as
+illustrated above.
+ Do not use \underscore in math mode; use \underline instead.