This file is indexed.

/usr/share/lyx/layouts/tufte-handout.layout is in lyx-common 2.2.2-1.

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The actual contents of the file can be viewed below.

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#% Do not delete the line below; configure depends on this
#  \DeclareLaTeXClass[tufte-handout,bibentry.sty,changepage.sty,fancyhdr.sty,hardwrap.sty,ifmtarg.sty,ifplatform.sty,letterspace.sty,multicol.sty,natbib.sty,optparams.sty,paralist.sty,placeins.sty,ragged2e.sty,setspace.sty,textcase.sty,titlesec.sty,titletoc.sty,xcolor.sty,xifthen.sty,xkeyval.sty]{Tufte Handout}
#  \DeclareCategory{Handouts}
# tufte-handout textclass definition file.
# Juergen Spitzmueller <juergen@spitzmueller.org>, 2008/10/22
# Modified by Uwe Stöhr <uwestoehr@web.de>, 2009/11/15

Format 60

# import other layouts
Input stdlayouts.inc
Input article.layout
Input tufte-book.layout

Sides		1
PageStyle	plain

NoStyle Part
NoCounter part
NoStyle Chapter
NoStyle Chapter*

Style Part
	Category	Sectioning
	Margin		Dynamic
	LabelType	No_Label
	TocLevel	-1
	LatexType	Command
	LatexName	part
	NeedProtect	1
	NextNoIndent	1
	Labelsep	xxx
	ParSkip		0.4
	TopSep		4
	BottomSep	4
	ParSep		0.8
	Align		Center
	Alignpossible	Center
	Argument 1
	  LabelString	"Short Title|S"
	  Tooltip	"The part as it appears in the table of contents/running headers"
	  InsertCotext   1
	EndArgument
	Font
	  Series	Bold
	  Size		Huge
	EndFont
End

Style Abstract
	Margin		Static
	LatexType	Environment
	LatexName	abstract
	Category	FrontMatter
	NextNoIndent	1
	LeftMargin	MMM
	RightMargin	MMM
	ParIndent	MM
	ItemSep		0
	TopSep		0.7
	BottomSep	0.7
	ParSep		0
	Align		Block
	LabelType	Centered
	LabelString	"Abstract"
	LabelBottomSep	0.5
	Font
	  Size		Small
	EndFont
	LabelFont
	  Series	Bold
	  Size		Large
	EndFont
End