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The siunitx package --- A comprehensive (SI) units package
Maintained by Joseph Wright
Released under the LaTeX Project Public License v1.3c or later

Typesetting values with units requires care to ensure that the
combined mathematical meaning of the value plus unit combination
is clear.  In particular, the SI units system lays down a
consistent set of units with rules on how these are to be used.
However, different countries and publishers have differing
conventions on the exact appearance of numbers (and units).

The siunitx package provides a set of tools for authors to
typeset numbers and units in a consistent way.  The package has
an extended set of configuration options which make it possible
to follow varying typographic conventions with the same input
syntax.  The package includes automated processing of numbers
and units, and the ability to control tabular alignment of

A number of LaTeX packages have been developed in the past for
formatting units: SIunits, sistyle, unitsdef, units, fancyunits
and fancynum.  Support for users of all of these packages is
available as emulation modules in siunitx.  In addition, siunitx
can carry out many of the functions of the dcolumn, rccol and
numprint packages