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/usr/share/lyx/layouts/iopart.layout is in lyx-common 2.2.3-5.

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#% Do not delete the line below; configure depends on this
#  \DeclareLaTeXClass[iopart,amsmath.sty,amssymb.sty,iopams.sty,setstack.sty]{Institute of Physics (IOP)}
#  \DeclareCategory{Articles}
# IOP article textclass definition file.
# Author: Uwe Stöhr (uwestoehr@web.de)

Format 60

Columns			1
Sides			1
SecNumDepth		3
TocDepth		3
DefaultStyle		Standard

ClassOptions
	FontSize	10|12
end

Preamble
	\usepackage{iopams}
	\usepackage{setstack}
EndPreamble

# This is just to show how to declare the default font.
# The defaults are exactly those shown here.
DefaultFont
	Family		Roman
	Series		Medium
	Shape		Up
	Size		Normal
	Color		None
EndFont


Style Standard
	Category	MainText
	Margin		Static
	LatexType	Paragraph
	LatexName	dummy
	ParIndent	MM
	ParSkip		0.4
	Align		Block
	AlignPossible	Block, Left, Right, Center
	LabelType	No_Label
End


Input stdcounters.inc
Input stdfloats.inc
Input stdlists.inc
Input stdsections.inc
Input stdstarsections.inc

NoStyle Chapter
NoCounter chapter
NoStyle Chapter*

Style Title
	Margin		Static
	LatexType	Command
	LatexName	title
	Category	FrontMatter
	InTitle		1
	Argument 1
	  LabelString	"Short Title|S"
	  Tooltip	"Short title that will appear in header line"
	  InsertCotext   1
	EndArgument
	ParSkip		0.4
	ItemSep		0
	TopSep		0
	BottomSep	1
	ParSep		1
	Align		Center
	LabelType	No_Label
	Font
	  Size		Largest
	EndFont
	HTMLTitle	true
End


Style Review
	CopyStyle	Title
	LatexName	review
End


Style Topical
	CopyStyle	Title
	LatexName	topical
End


Style Comment
	CopyStyle	Title
	LatexName	comment
End


Style Note
	CopyStyle	Title
	LatexName	note
End


Style Paper
	CopyStyle	Title
	LatexName	paper
End


Style Prelim
	CopyStyle	Title
	LatexName	prelim
End


Style Rapid
	CopyStyle	Title
	LatexName	rapid
End


Style Letter
	CopyStyle	Title
	ResetArgs	1
	LatexName	letter
End


Style Author
	Margin		Static
	LatexType	Command
	LatexName	author
	Category	FrontMatter
	InTitle		1
	LabelSep	xxx
	ParSkip		0.4
	TopSep		1.3
	BottomSep	0.7
	ParSep		0.7
	Align		Center
	LabelType	No_Label
	Font
	  Size		Large
	EndFont
End


Style Address
	Margin		Static
	LatexType	Command
	LatexName	address
	Category	FrontMatter
	InTitle		1
	ParSkip		0.4
	Align		Center
	LabelType	No_Label
	Font
	  Shape		Italic
	EndFont
End


Style Email
	CopyStyle	Address
	LatexName	ead
	BottomSep	0.5
	Font
	  Shape		Up
	EndFont
End


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


Style Keywords
	Margin		Dynamic
	LatexType	Command
	LatexName	"noindent{\it Keywords\/}: "
	Category	FrontMatter
	InTitle		1
	ParSkip		0.4
	BottomSep	0.5
	Align		Left
	LabelSep	xx
	LabelType	Static
	LabelString	"Keywords:"
	LabelFont
	  Color		Green
	  Series	Bold
	EndFont
End


Style PACS
	CopyStyle	Keywords
	LatexName	pacs
	LabelString	"Physics and Astronomy Classification System number:"
End


Style MSC
	CopyStyle	Keywords
	LatexName	ams
	LabelString	"Mathematics Subject Classification number:"
End


Style submitto
	CopyStyle	Keywords
	LatexName	submitto
	LabelString	"submit to paper:"
End


Style Acknowledgments
	Margin		Dynamic
	LatexType	Command
	LatexName	ack{}
	Category	BackMatter
	NeedProtect	1
	NextNoIndent	1
	KeepEmpty	1
	LabelSep	xxx
	ParSkip		0.4
	TopSep		0.7
	BottomSep	0.4
	Align		Block
	LabelType	Static
	LabelString	"Acknowledgments"
	Font
	  Series	Bold
	  Size		Normal
	EndFont
End


Style "Bibliography (plain)"
	Margin		First_Dynamic
	LatexType	Bib_Environment
	LatexName	thebibliography
	Category	BackMatter
	NextNoIndent	1
	ToggleIndent	Never
	LeftMargin	MM
	ParSkip		0.4
	ItemSep		0
	TopSep		0.7
	BottomSep	0.7
	ParSep		0.5
	Align		Block
	AlignPossible	Block, Left
	LabelType	Bibliography
	LabelString	"References"
	LabelBottomSep	1.2
	LabelFont
	  Series	Bold
	  Size		Larger
	EndFont
End


Style "Bibliography heading"
	CopyStyle	Section
	LatexName	section*{References}
	Category	BackMatter
	KeepEmpty	1
	LabelType	Static
	LabelString	"References"
End

Style Quotation
	Category              MainText
	Margin                Static
	LatexType             Environment
	LatexName             quotation
	NextNoIndent          1
	ToggleIndent          Always
	LeftMargin            MMM
	RightMargin           MMM
	ParIndent             MM
	ParSkip               0
	ItemSep               0
	TopSep                0.5
	BottomSep             0.5
	ParSep                0
	Align                 Block
	AlignPossible         Block, Left, Right, Center
	HTMLTag               blockquote
	HTMLItem              div
	ForceLocal            1
End


Style Quote
	Category              MainText
	Margin                Static
	LatexType             Environment
	LatexName             quote
	NextNoIndent          1
	ToggleIndent          Never
	LeftMargin            MMM
	RightMargin           MMM
	TopSep                0.5
	ParSep                0.5
	BottomSep             0.5
	Align                 Block
	AlignPossible         Block, Left, Right, Center
	LabelType             No_Label
	HTMLTag               blockquote
	HTMLItem              div
	ForceLocal            1
End


Style Verse
	# LaTeX type is first dynamic because of LaTeX implementation.
	# In LyX this does not make sense.
	Category              MainText
	LatexType             Environment
	LatexName             verse
	Margin                First_Dynamic
	NextNoIndent          1
	LeftMargin            MMMM
	LabelIndent           MMMM
	ParSkip               0.4
	TopSep                0.7
	BottomSep             0.7
	ParSep                0.5
	Align                 Block
	AlignPossible         Block, Left
	LabelType             No_Label
	HTMLTag               blockquote
	HTMLItem              p
	ForceLocal            1
End


Style Verbatim
	Category              MainText
	LatexType             Environment
	LatexName             verbatim
	NextNoIndent          1
	ParbreakIsNewline	  1
	FreeSpacing           1
	PassThru              1
	KeepEmpty             1
	NewLine               0
	TopSep                0.7
	BottomSep             0.7
	Align                 Block
	AlignPossible         Block
	LabelType             No_Label
	Font
	  Family              Typewriter
	EndFont
	HTMLTag               <pre></pre>
	HTMLItem              p
	ForceLocal            1
End


Style Verbatim*
	CopyStyle             Verbatim
	LatexName             verbatim*
	ForceLocal            1
End