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`@dmn'{DIMENSION}: Format a Dimension
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At times, you may want to write `12pt' or `8.5in' with little or no
space between the number and the abbreviation for the dimension. You
can use the `@dmn' command to do this. On seeing the command, TeX
inserts just enough space for proper typesetting; the Info formatting
commands insert no space at all, since the Info file does not require
it.
To use the `@dmn' command, write the number and then follow it
immediately, with no intervening space, by `@dmn', and then by the
dimension within braces.
For example,
A4 paper is 8.27@dmn{in} wide.
produces
A4 paper is 8.27in wide.
Not everyone uses this style. Instead of writing `8.27@dmn{in}' in
the Texinfo file, you may write `8.27 in.' or `8.27 inches'. (In these
cases, the formatters may insert a line break between the number and the
dimension. Also, if you write a period after an abbreviation within a
sentence, you should write `@:' after the period to prevent TeX from
inserting extra whitespace. Controlling Spacing)