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/usr/share/lyx/layouts/iucr.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[iucr,float.sty,harvard.sty,html.sty,multicol.sty,tabularx.sty]{International Union of Crystallography (IUCr)}
#  \DeclareCategory{Articles}
# IUCr article textclass definition file.
# Author: Uwe Stöhr (uwestoehr@web.de)
# IUCr LaTeX files can be downloaded from ftp://ftp.iucr.org/templates/latex/

Format 60

Columns				1
Sides				1
SecNumDepth			3
TocDepth			3
DefaultStyle		Standard

ClassOptions
	FontSize		10
end

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

NoStyle Chapter
NoCounter chapter
NoStyle Chapter*
NoStyle Author
NoStyle Bibliography

Style Section
	LabelString			\thesection.
	LabelStringAppendix	\thesection
	Align				Center
End

Style Subsection
	LabelString			\thesubsection.
	Font
	  Shape				Italic
	  Size				Normal
	EndFont
End

Style Subsubsection
	LabelString			\thesubsubsection.
	Font
	  Shape				Italic
	EndFont
End

Style "Short Title"
	CopyStyle		Title
	LatexName		shorttitle
	Font
	  Size			Small
	EndFont
End

InsetLayout "Flex:City"
	LyxType			custom
	LatexType		command
	ForcePlain		1
	LatexName		city
	LabelString		"City"
	Font
	  Color			foreground
	  Size			Small
	  Family		Roman
	  Shape			Up
	  Series		Medium
	  Misc			No_Emph
	  Misc			No_Noun
	  Misc			No_Bar
	EndFont
	LabelFont
	  Color			green
	  Size			Small
	EndFont
End

InsetLayout "Flex:Country"
	CopyStyle		"Flex:City"
	LatexName		country
	LabelString		"Country"
End

InsetLayout "Flex:Author Footnote"
	CopyStyle		"Flex:City"
	LatexName		aufn
	LabelString		"Author Footnote"
End

Style "Main Author"
	Margin			Static
	LatexType		Command
	LatexName		cauthor
	Category		FrontMatter
	InTitle			1
	NextNoIndent	1
	Argument 1
	  LabelString	"Affiliation Key"
	  Tooltip		"Affiliation key of the author"
	EndArgument
	Argument 2
	  Mandatory		1
	  LabelString	"Forename"
	  Tooltip		"Forename"
	EndArgument
	Argument 3
	  Mandatory		1
	  LabelString	"Surname"
	  Tooltip		"Surname"
	EndArgument
	Argument 4
	  Mandatory		1
	  LabelString	"Email"
	  Tooltip		"Email"
	  Font
	    Shape		Italic
	  EndFont
	EndArgument
	BottomSep		0.5
	ParSkip			0.4
	Align			Center
	LabelType		No_Label
End

Style "Co Author"
	CopyStyle		"Main Author"
	LatexName		author
	LabelString		"Co-author"
	ResetArgs		1
	Argument 1
	  LabelString	"Affiliation Key"
	  Tooltip		"Affiliation key of the co-author"
	EndArgument
	Argument 2
	  Mandatory		1
	  LabelString	"Forename"
	  Tooltip		"Forename"
	EndArgument
End

Style "Short Author"
	CopyStyle		"Co Author"
	LatexName		shortauthor
	LabelString		"Short author:"
	ResetArgs		1
	LabelType		Static
	Align			Block
	Margin			Dynamic
	LabelSep		xx
	LabelFont
	  Series		Bold
	  Color			Green
	EndFont
End

Style Affiliation
	CopyStyle		"Short Author"
	LatexName		aff
	Category		FrontMatter
	LabelString		"Affiliation:"
	Argument 1
	  LabelString	"Affiliation Key"
	  Tooltip		"Affiliation key"
	EndArgument
	Font
	  Shape			Italic
	EndFont
	LabelFont
	  Series		Bold
	  Color			Green
	  Shape			Up
	EndFont
End

Style Keyword
	CopyStyle		"Short Author"
	LatexName		keyword
	LabelString		"Keyword:"
End

Style Vita
	CopyStyle		"Short Author"
	LatexName		vita
	LabelString		"Vita:"
End

Style "PDB reference"
	CopyStyle		"Short Author"
	LatexName		PDBreference
	LabelString		"PDB reference:"
	Argument 1
	  LabelString	"Name"
	  Tooltip		"Optional name"
	EndArgument
End

Style "NDB reference"
	CopyStyle		"PDB reference"
	LatexName		NDBreference
	LabelString		"NDB reference:"
End

Style Synopsis
  CopyStyle			Abstract
  LatexName			synopsis
  LabelString		"Synopsis"
  Align				Left
  AlignPossible		Left
End

Style Acknowledgements
  CopyStyle			"Short Author"
  LatexName			ack
  InTitle			0
  LabelString		"Acknowledgements:"
  Category			BackMatter
  TopSep			0.7
End

Style References
  Margin			Static
  Category			BackMatter
  LatexType			Item_Environment
  LatexName			references
  ItemCommand		reference
  LabelType			Centered
  LabelString		"References"
  LabelFont
   Size larger
   Series bold
  EndFont
  ParagraphGroup	1
  NextNoIndent		1
  TopSep			0.7
  BottomSep			0.7
  Argument item:1
    LabelString		"Reference"
    Mandatory		1
    AutoInsert		1
  EndArgument
  Align				Left
End