setspace

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+%%% ======================================================================
+%%%  @LaTeX-style-file{
+%%%     filename        = "setspace.sty",
+%%%     version         = "6.7",
+%%%     date            = "Fri 1 December 2000",
+%%%     time            = "17:49 UT+11",
+%%%     author          = "Geoffrey Tobin",
+%%%     address         = "Department of Electronic Engineering
+%%%                        Faculty of Science and Technology
+%%%                        La Trobe University
+%%%                        Bundoora VIC 3086
+%%%                        Australia",
+%%%     email           = "G.Tobin@latrobe.edu.au (Internet)",
+%%%     telephone       = "(+ 613) 9479-3736",
+%%%     FAX             = "(+ 613) 9479-3025",
+%%%     supported       = "yes",
+%%%     archived        = "CTAN",
+%%%     distribution    = "freely redistributable",
+%%%     keywords        = "LaTeX package, line spacing",
+%%%     codetable       = "ISO/ASCII",
+%%%     checksum        = "11793 546 2608 21972",
+%%%     docstring       = "setspace.sty is a LaTeX (2e) package.
+%%%                        Comments and bug reports welcome!
+%%%                        
+%%%                        This includes GDG's modification to Erica Harris'
+%%%                        setspace.sty.  The main aspects of this
+%%%                        modification deal with the definitions of
+%%%                        \singlespacing \onehalfspacing, and
+%%%                        \doublespacing, (these are near the beginning of
+%%%                        the file).  Primarily, these deal with adding
+%%%                        fontsize changes to guarantee that the new
+%%%                        baseline is properly defined and placed into
+%%%                        action.  The extra \vskip in the definition of
+%%%                        \singlespacing seems to  make for a cleaner
+%%%                        transition from multiple spacing back to single
+%%%                        spacing.  These did not appear warrranted for
+%%%                        other size changes.
+%%%
+%%%                        Modified by GDG on November 1, 1992, to allow
+%%%                        for use of New Font Selection Scheme.
+%%%
+%%%                        Modified by GDG on June 4, 1993, to correct
+%%%                        for spacing tokens in definition of \@setsize
+%%%                        Thanks to Kaja P. Christiansen <kaja@daimi.aau.dk>
+%%%                        for the fix!!
+%%%
+%%%                        Modified by GDG on May 24, 1994, to change toggle
+%%%                        definition from \selectfont to \@newbaseline.
+%%%
+%%%                        Modified by GDG on May 25, 1994, to add
+%%%                        definition of \everydisplay -- this part of
+%%%                        the code was apparently written by Geoffrey
+%%%                        Tobin on Thu 23 Jan 1992 and was provided by
+%%%                        stanton@haas.berkeley.edu (Richard Stanton). 
+%%%                        This should help with some of the awkward math
+%%%                        placements in changing spacings.
+%%%
+%%%                        Modified by GT on 23 Jan 1996, to correct
+%%%                        \everymath bug, first reported by Mario
+%%%                        Wolczko <mario@cs.man.ac.uk> on 9 June 1992.
+%%%                        
+%%%                        Modified by GT on 23 Jan 1996, to correct
+%%%                        usage of comment characters in macro
+%%%                        definitions.
+%%%
+%%%                        Modified by GT on 23 Jan 1996, to update
+%%%                        (adjusted) \@xfloat definition for LaTeX2e.
+%%%                        Bug report was courtesy of Kay Nettle.
+%%%
+%%%                        Modified by GT on 24 Jan 1996, to update
+%%%                        (adjusted) \@footnotetext definition for
+%%%                        LaTeX2e, and to add an adjusted LaTeX2e
+%%%                        \@mpfootnotext definition for minipages.
+%%%                        Bug report was courtesy Kay Nettle.
+%%%
+%%%                        Changed by GT on 6 Feb 1996, into a LaTeX2e
+%%%                        package.
+%%%
+%%%			   Made more package-like by GT on 14 Feb 1996,
+%%%			   by adding standard messages.
+%%%
+%%%			   GT replaced \@normalsize by \normalsize on 28
+%%%			   Sep 1996.  This change was successively
+%%%			   advised by:
+%%%
+%%%			     Rowland J.~Bartlett
+%%%			     <R.J.Bartlett@bolton.ac.uk>
+%%%			     on Tue 6 Aug 96,
+%%%
+%%%			     Ted Stern
+%%%			     <stern@amath.washington.edu>
+%%%			     on Wed 7 Aug 96,
+%%%
+%%%			     Michal Jaegermann
+%%%			     <michal@ellpspace.math.ualberta.ca>
+%%%			     on Fri 27 Sep 96.
+%%%
+%%%                        GT:  Sat 28 Sep 1996:  Added call to
+%%%                        \setspace@size in \setstretch, as suggested
+%%%                        by David Hull <hull@cs.uiuc.edu>
+%%%                        on Wed 24 July 1996.
+%%%
+%%%                        GT:  Sat 28 Sep 1996:  Pared \setspace@size
+%%%                        mercilessly down to \@currsize, following
+%%%                        advice given on Fri 27 Sep 1996 by Michal
+%%%                        Jaegermann <michal@ellpspace.math.ualberta.ca>.
+%%%                        Retained this macro for flexibility.
+%%%
+%%%			   Code rearranged by GT, Sat 28 Sep 1996, to give
+%%%			   greater prominence to \setstretch.
+%%%
+%%%			   Also, GT changed (Sat 28 Sep 1996) many
+%%%			   occurrences of \def to \newcommand,
+%%%			   \renewcommand, or \newenvironment,
+%%%			   as seemed appropriate.
+%%%
+%%%                        GT, Tue 10 Dec 1996:  Following a suggestion
+%%%                        by Ted Stern, the `single' spacing is now
+%%%                        settable by the user.  This is for slightly
+%%%                        large fonts such as Lucida Bright.
+%%%
+%%%                        GT, Wed 11 Dec 1996:  For simplicity and
+%%%                        maintainability, call \onehalfspacing in
+%%%                        the onehalfspace environment, and
+%%%                        \doublespacing in the doublespace
+%%%                        environment.
+%%%
+%%%                        GT, Wed 11 Dec 1996:  Also deleted
+%%%                        \setspace@size from \setstretch,
+%%%                        as \@currsize suffices.
+%%%
+%%%                        Modified by Brett Presnell (BP)
+%%%                        <presnell@maths.anu.edu.au> on 21 Mar 1998
+%%%                        to add nodisplayskipstretch option, which
+%%%                        turns off the stretching of the space
+%%%                        before and after displays, which is often
+%%%                        excessive, particularly with doublespaced
+%%%                        documents.  Also added the
+%%%                        setdisplayskipstretch command, which allows
+%%%                        the user to choose by how much to stretch
+%%%                        the space before and after displays
+%%%                        independently from the setting of
+%%%                        baselinestretch.  This works regardless of
+%%%                        whether the nodisplayskipstretch option is
+%%%                        in effect.
+%%%
+%%%                        GT, Wed 15 Apr 1998:  Added the singlespace*
+%%%                        environment requested by
+%%%                        Mark Olesen <olesen@weber.me.queensu.ca>
+%%%                        on Sat 24 May 1997 and Wed 18 June 1997.
+%%%                        This is reported to give improved vertical
+%%%                        spacing around itemize and quote environments.
+%%%
+%%%                        GT, Wed 15 Apr 1998:  David Hull pointed out on
+%%%                        Fri 12 Dec 1997 that the \belowdisplayskip line
+%%%                        in the \everydisplay was mistyped.  Now fixed.
+%%%
+%%%                        GT, Thu 26 Nov 1998:  Finally got round to
+%%%                        fixing the absence of \begingroup from
+%%%                        onehalfspace and doublespace environments.
+%%%                        Thanks to:  Bernd Schandl, Ron Smith,
+%%%                        Himanshu Gohel, and Kevin Ruland, for bringing
+%%%                        it to my long overdue attention.
+%%%
+%%%                        GT, Tue 27 July 1999:  On Saturday 24 July
+%%%                        1999, Alexander L. Wolf <alw@cs.colrado.edu>
+%%%                        informed me that the \doublespace and
+%%%                        \onehalfspace _macros_ are still at fault.
+%%%
+%%%                        GT, Fri 3 March 2000:  Today Stefano
+%%%                        Lacaprara of Italy brought my attention to
+%%%                        the need to extend the commands and macros
+%%%                        to point sizes other than 10, 11 and 12.
+%%%                        Since there's no general formula for the
+%%%                        line stretch values in terms of point size,
+%%%                        and they vary only slightly between 10, 11
+%%%                        and 12 pt, and furthermore the values were
+%%%                        presumably optimised specifically for the
+%%%                        Computer Modern fonts, i've chosen to use
+%%%                        the 10 pt values as the generic defaults.
+%%%
+%%%                        GT, Fri 1 December 2000:  George Pearson
+%%%                        requested package options for the three
+%%%                        common spacings.
+%%%
+%%%                        The checksum field above contains a CRC-16
+%%%                        checksum as the first value, followed by the
+%%%                        equivalent of the standard UNIX wc (word
+%%%                        count) utility output of lines, words, and
+%%%                        characters.  This is produced by Robert
+%%%                        Solovay's checksum utility."
+%%% }
+%%% ======================================================================
+%% FILE:   setspace.sty in SYS2.TEX.PUB.ISULATEX.STYLES
+%% AUTHOR: Erica M. S. Harris
+%% DATE:   April 1990
+%% MOD:    March 1991
+%%%
+%%% Update to LaTeX (2e) :  6 Feb 1996.
+%%% Description:  LaTeX Document Package "setspace"
+%%%
+%%% Usage:
+%%%                \documentclass[...]{...}
+%%%                \usepackage{setspace}
+%%%
+%%         Based on the doublespace option created by Stephen Page.
+%%
+%%         This style option provides commands and environments for doing
+%%         double and  one-and-a-half spacing based on pt size.
+%%
+%%         Single spacing is the default.
+%%
+%%         Three commands, \singlespacing, \onehalfspacing, and
+%%         \doublespacing, are for use in the preamble to set the overall
+%%         spacing for the document.  If a different spacing is required then
+%%         the \setstretch{baselinestretch} command can be used in the
+%%         preamble to set the baselinestretch appropriately.  The default
+%%         spacing with this style option is single spacing.
+%%
+%%         Three environments, singlespace, onehalfspace, and doublespace,
+%%         allow the spacing to be changed within the document.  Both the
+%%         onehalfspace and doublespace environments are intended to increase
+%%         the spacing, so the onehalfspace environment should not be used in
+%%         a double spaced document.  If an increased spacing different from
+%%         one-and-a-half or double spacing is required then the spacing
+%%         environment can be used.  The spacing environment takes one
+%%         argument which is the larger baselinestretch to use,
+%%         e.g., \begin{spacing}{2.5}.
+%%
+%%         \footins is adjusted the same as \parskip - appears to work. Lose
+%%         stretch parts but don't consider that to be crucial
+%%
+%%         Removed code for altering spacing before and after displayed
+%%         equations - just looked too much.
+%%
+%% MODS:
+%%         Redefinition of \spacing and \endspacing for consistency with
+%%         TeX 3.x inserted by George Greenwade.  Modification provided by
+%%         Philip Ross (ROSS@UK.AC.ABDN.BIOMED) and John Byrne via INFO-TeX.
+%%
+%% PLEASE REPORT ANY BUGS
+%%
+%%   Old Documentation follows:
+%%         1. A new environment "singlespace" is provided, within which single
+%%            spacing will apply.
+%%            JFL - changed so that it works in regular text and so that
+%%            vertical space before and after is correctly computed
+%%         2. Double spacing is turned off within footnotes and floats (figures
+%%            and tables).
+%%         3. Proper double spacing happens below tabular environments and in
+%%            other places where LaTeX uses a strut.
+%%         4. Slightly more space is inserted before footnotes.
+%%         5. JFL - fixes spacing before and after displayed math
+%%
+%%
+%%    mods:   Jean-Francois Lamy
+%%            lamy@ai.toronto.edu
+%%            lamy@utai.uucp
+%%
+%% POSSIBLE BUGS:
+%%    . Increasing struts may possibly cause some other obscure part of
+%%      formatting to fall over.
+%%    . \begin{singlespace}\begin{quote} produces the wrong spacing before
+%%      the quote (extra glue is inserted).
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\NeedsTeXFormat {LaTeX2e}[1994/12/01]
+\def \filename {setspace.sty}
+\def \filedate {2000/12/01}
+\def \fileversion {6.7}
+\ProvidesPackage {setspace}[\filedate\space\fileversion\space
+  Contributed and Supported LaTeX2e package]
+\typeout {Package: `setspace' \fileversion\space <\filedate>}
+
+% BP: add nodisplayskipstretch option and \setdisplayskipstretch command.
+
+\newcommand{\displayskipstretch}{\baselinestretch}
+\newcommand{\setdisplayskipstretch}[1]{\renewcommand{\displayskipstretch}{#1}}
+\DeclareOption{nodisplayskipstretch}{\setdisplayskipstretch{1.0}}
+
+% GT: add George Pearsons' suggested options.
+
+\DeclareOption{singlespacing}{\AtEndOfPackage{\singlespacing}}
+\DeclareOption{onehalfspacing}{\AtEndOfPackage{\onehalfspacing}}
+\DeclareOption{doublespacing}{\AtEndOfPackage{\doublespacing}}
+
+\ProcessOptions
+
+% GT:  Sat 28 Sep 1996:  Widely using \newcommand, \renewcommand, and
+% \newenvironment, instead of \def.
+
+% ** Line space commands.
+
+\newcommand{\setstretch}[1]{%
+  \def\baselinestretch{#1}%
+  \@currsize
+}
+
+% GT:  Sat 28 Sep 1996:  spacing commands and environments modified to
+% use \setstretch instead of \baselinestretch.
+%
+% GT:  Sat 28 Sep 1996:  No, I don't know understand the line spacing
+% algorithms!  If someone (LaTeX team) can enlighten me as to the
+% general rule, please do!  It would be very pleasant if setspace.sty
+% were suited for document font sizes other than 10, 11 and 12 pt.
+%
+% GT:  Tue 10 Dec 1996:  Instead of fixing singlespacing to exact unity,
+% allow user to redefine it (only slightly, please!) from its initial
+% value of unity, in the case when a particular font is slightly larger
+% or slightly smaller than its point size would indicate.  This change
+% affects setspace's single spacing commands, and LaTeX's footnote and
+% float environments.  The one and a half, double, and arbitrary
+% spacing commands are unaltered.
+
+\newcommand{\SetSinglespace}[1]{%
+  \def\setspace@singlespace{#1}%
+}
+
+% Here's the default single line spacing value.
+\SetSinglespace{1}
+
+\newcommand{\singlespacing}{%
+  \setstretch {\setspace@singlespace}%  normally 1
+  \vskip \baselineskip  % Correction for coming into singlespace
+}
+
+\newcommand{\onehalfspacing}{%
+  \setstretch{1.25}%  default
+  \ifcase \@ptsize \relax % 10pt
+    \setstretch {1.25}%
+  \or % 11pt
+    \setstretch {1.213}%
+  \or % 12pt
+    \setstretch {1.241}%
+  \fi
+}
+
+\newcommand{\doublespacing}{%
+  \setstretch {1.667}%  default
+  \ifcase \@ptsize \relax % 10pt
+    \setstretch {1.667}%
+  \or % 11pt
+    \setstretch {1.618}%
+  \or % 12pt
+    \setstretch {1.655}%
+  \fi
+}
+
+% ** Modification of the LaTeX command \@setsize.
+
+%---Stretch the baseline BEFORE calculating the strut size. This improves
+%   spacing below tabular environments etc., probably...
+%   Comments are welcomed.
+
+% GT:  Sun 29 Sep 1996:  Question:  Is this code anywhere near correct
+% since this part of LaTeX (in, eg, latex.ltx) has been greatly changed?
+
+% GT:  Sun 29 Sep 1996:  The meanings of the arguments to \@setsize
+% appear to be (whatever these may signify) :
+% current size; font baselineskip; ignored (!); and font size.
+
+% GT:  Sun 29 Sep 1996:  Note that \@setsize (in latest LaTeX,
+% \@setfontsize, which is called by \@setsize) seems to be the only
+% place in purely modern LaTeX where \@currsize is set, and ltxguide.cls
+% seems to be the only file in the LaTeX base distribution that uses it!
+
+\def\@setsize#1#2#3#4{%
+  % Modified 1993.04.07--GDG per KPC
+  \@nomath#1%
+  \let\@currsize#1%
+  \baselineskip #2%
+  \baselineskip \baselinestretch\baselineskip
+  \parskip \baselinestretch\parskip
+  \setbox\strutbox \hbox{%
+    \vrule height.7\baselineskip
+           depth.3\baselineskip
+           width\z@}%
+  \skip\footins \baselinestretch\skip\footins
+  \normalbaselineskip\baselineskip#3#4}
+
+% ** Float and footnote adjustments to compensate for a change in the
+% ** main text's line spacing.
+
+%---Increase the space between last line of text and footnote rule.
+%\skip\footins 20pt plus4pt minus4pt
+
+%---Reset baselinestretch within floats and footnotes.
+
+% GT:  Tue 23 Jan 1996:  This is where the conflict with the combination
+% of the color package and the figure environment used to occur.
+
+% Floats.
+
+% GT:  Sat 28 Sep 1996:  \@xfloat is the only place where \normalsize
+% is still used in setspace.sty !
+
+\let\latex@xfloat=\@xfloat
+\def\@xfloat #1[#2]{%
+  \latex@xfloat #1[#2]%
+  \def\baselinestretch{\setspace@singlespace}%
+  \normalsize
+}
+
+% GT:  Wed 24 Jan 1996:  This footnote code was copied from LaTeX and
+% modified rather naively.  It had to be brought up to date, not only
+% because of LaTeX's new color ability, but also because ther had
+% been major changes to this code in LaTeX at least as far back as
+% March 1992.
+
+% Normal, bottom of the page, footnotes.
+%
+% GT:  Based HEAVILY on original LaTeX (2e) code.  A standard hook would
+% be MUCH preferred, so that LaTeX's footnote implementation needn't be
+% copied each time it changes.
+%
+% GT:  The \protected@edef requires at least the December 1994 LaTeX.
+% This is precisely the kind of VERSION DEPENDENCY situation that
+% cannot (AFAIK) be avoided, because LaTeX (2e) LACKS appropriate
+% standard hooks and/or context markers.
+
+\long\def\@footnotetext#1{%
+  \insert\footins{%
+% GT:  Next line added.  Hook desired here!
+    \def\baselinestretch {\setspace@singlespace}%
+    \reset@font\footnotesize
+    \interlinepenalty\interfootnotelinepenalty
+    \splittopskip\footnotesep
+    \splitmaxdepth \dp\strutbox \floatingpenalty \@MM
+    \hsize\columnwidth
+    \@parboxrestore
+    \protected@edef\@currentlabel{%
+      \csname p@footnote\endcsname\@thefnmark
+    }%
+    \color@begingroup
+      \@makefntext{%
+        \rule\z@\footnotesep\ignorespaces#1\@finalstrut\strutbox}%
+    \color@endgroup}}
+
+% Minipage footnotes.
+
+\long\def\@mpfootnotetext#1{%
+  \global\setbox\@mpfootins\vbox{%
+    \unvbox \@mpfootins
+%  GT:  Next line added.  Hook desired here!
+    \def\baselinestretch {\setspace@singlespace}%
+    \reset@font\footnotesize
+    \hsize\columnwidth
+    \@parboxrestore
+    \protected@edef\@currentlabel{%
+      \csname p@mpfootnote\endcsname\@thefnmark}%
+    \color@begingroup
+      \@makefntext{%
+       \rule\z@\footnotesep\ignorespaces#1\@finalstrut\strutbox}%
+   \color@endgroup}}
+
+% ** Line space environments.
+
+% A single spaced quote (say) is done by surrounding singlespace with quote.
+
+\newenvironment{singlespace}{%
+  \vskip \baselineskip
+  \setstretch {\setspace@singlespace}%
+  \vskip -\baselineskip
+}{%
+  \par
+}
+
+% GT (c/o Mark Olesen), Wed 15 April 1998.
+
+\newenvironment{singlespace*}{%
+  \setstretch {\setspace@singlespace}%
+  \vskip -\baselineskip
+}{%
+  \vskip -0.5\baselineskip
+}
+
+%  spacing, doublespace and onehalfspace all are meant to INCREASE the
+%  spacing (i.e. calling onehalfspace from within doublespace will not
+%  produce a graceful transition between spacings)
+%
+% Next two definitions fixed for consistency with TeX 3.x
+
+% In order to use \newenvironment, while easily using same code for
+% end of each environment, the code that used to be in \endspacing has
+% been moved into a new (but internal) macro, \restore@spacing.
+
+\newcommand{\restore@spacing}{%
+    \par
+    \vskip \parskip
+    \vskip \baselineskip
+  \endgroup
+  \vskip -\parskip
+  \vskip -\baselineskip
+}
+
+\newenvironment{spacing}[1]{%
+  \par
+  \begingroup             % moved from \endspacing by PGBR 29-1-91
+    \setstretch {#1}%
+}{%
+  \restore@spacing
+}
+
+% one and a half spacing is 1.5 x pt size
+\newenvironment{onehalfspace}{%
+  \begingroup
+    \onehalfspacing
+}{%
+  \restore@spacing
+}
+
+% double spacing is 2 x pt size
+\newenvironment{doublespace}{%
+  \begingroup
+    \doublespacing
+}{%
+  \restore@spacing
+}
+
+% GT:  EMSH chose to omit display math part that follows.
+% She wrote (see above) that the "altered spacing before and after displayed
+% equations ... just looked too much".
+%
+% Fix up spacing before and after displayed math
+% (arraystretch seems to do a fine job for inside LaTeX displayed math,
+% since array and eqnarray seem to be affected as expected).
+% Changing \baselinestretch and doing a font change also works if done here,
+% but then you have to change @setsize to remove the call to @nomath)
+%
+% GT:  The \belowdisplayskip line was mistyped; now fixed, courtesy of
+% David Hull.
+%
+% GT:  Brett Parnell has addressed EMSH's concern by replacing
+% \baselinestretch by \displayskipstretch in displays, as follows.
+
+\everydisplay\expandafter{%
+  \the\everydisplay
+  \abovedisplayskip \displayskipstretch\abovedisplayskip
+  \belowdisplayskip \displayskipstretch\belowdisplayskip
+  \abovedisplayshortskip \displayskipstretch\abovedisplayshortskip
+  \belowdisplayshortskip \displayskipstretch\belowdisplayshortskip
+}
+
+\endinput
+
+%%% EOF.