-The package is mainly distributed as source code, but others provide
-packages for Linux and Mac. Check your Linux distribution tools
-(search for gromacs). On Mac OS X the {\bf port} tool will allow you
-to install a recent version.
-On the home page you will find all the information you need to
-\normindex{install} the package, mailing lists with archives,
-and several additional on-line resources like contributed topologies, etc.
-%% The default installation action is simply to unpack the source code and
-%% then issue:
-%% \begin{verbatim}
-%% ./configure
-%% make
-%% make install
-%% \end{verbatim}
-%% The configuration script should automatically determine the best options
-%% for your platform, and it will tell you if anything is missing on
-%% your system. You will also find detailed step-by-step installation
-%% instructions on the website. There is a \normindex{cmake} based
-%% installation route as well:
-%% \begin{verbatim}
-%% cmake
-%% make
-%% make install
-%% \end{verbatim}
-%% which is being tested in the wild since {\gromacs} version 4.5.
-
-\section{Single or Double precision}
-{\gromacs} can be compiled in either single\index{single
-precision|see{precision, single}}\index{precision, single} or
-\pawsindex{double}{precision}. It is very important to note here that
-single precision is actually mixed precision. Using single precision
+\section{Mixed or Double precision}
+{\gromacs} can be compiled in either mixed\index{mixed
+precision|see{precision, mixed}}\index{precision, mixed} or
+\pawsindex{double}{precision}. Documentation of previous {\gromacs}
+versions referred to ``single precision'', but the implementation
+has made selective use of double precision for many years.
+Using single precision