This file is indexed.

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

This file is owned by root:root, with mode 0o644.

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[aa]{Astronomy & Astrophysics (V. 4, Obsolete)}
#  \DeclareCategory{Articles}
#
# Author: Peter Sütterlin <pit@uni-sw.gwdg.de>

# This is for the old Springer layout of A&A (aa.cls version 4.x)
# If you still have this, please upgrade to version 5 (see Additional.lyx)
#
# If you want to keep the layout for old papers I'd suggest to rename
# the old style file to aa-old and change the second line in this file to
#
#  \DeclareLaTeXClass[aa-old]{Astronomy & Astrophysics (V. 4, Obsolete)}
#
# and reconfigure LyX (after running texhash, of course).


Format 60
Columns                 2
Sides                   2
SecNumDepth             3
TocDepth                0
PageStyle               Plain


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


# I want to keep the entries in a logical order.
# Therefore I'll define the entries first, then fill them
Style Itemize
End

Style Enumerate
End

Style Description
End

Style List
End


Style LaTeX
End

Style Section
	TocLevel 1
End

Style Subsection
	TocLevel 2
End

Style Subsubsection
	TocLevel 3
End

Style Title
End

Style Subtitle
End

Style Author
End

Style Address
End

Style Email
End

Style Offprint
End

Style Thesaurus
End

Style Date
End

Style Abstract
End

Style Acknowledgement
End

Style Bibliography
End

# OK, now we have a more or less consistent Ordering. Now fill the
# definitions.  First, the standard includes

Input stdinsets.inc
Input stdlists.inc
Input stdlayouts.inc
Input stdsections.inc
Input stdtitle.inc
Input stdstruct.inc
Input stdfloats.inc
Input stdcounters.inc

NoStyle Quotation
NoStyle Quote
NoStyle Verse
NoStyle Chapter
NoCounter chapter
NoStyle Paragraph
NoCounter paragraph
NoStyle Subparagraph
NoCounter subparagraph
NoStyle Part
NoCounter part


Input aapaper.inc


Style Section
	TopSep                2.0
	BottomSep             1.3
	Font
	  Size                Normal
	EndFont
	TocLevel 1
End


Style Subsection
	TopSep                1.7
	BottomSep             1.1
	Font
	  Series              Medium
	  Size                Normal
	  Shape               Italic
	EndFont
	TocLevel 2
End


Style Subsubsection
	TopSep                1.7
	BottomSep             1.1
	Font
	  Series              Medium
	  Size                Normal
	EndFont
	TocLevel 3
End


Style Title
	TopSep                2
	BottomSep             1.3
	Align                 Left
	AlignPossible         Left
	Font
	  Series              Bold
	EndFont
End


Style Author
	Align                 Left
	AlignPossible         Left
	LabelType             No_Label
	Font
	  Size                Normal
	  Series              Bold
	EndFont
End


Style Date
	LabelSep              ""
	TopSep                1.2
	Align                 Left
	AlignPossible         Left
	Font
	  Size                Small
	EndFont
End


Style Abstract
	LeftMargin            ""
	RightMargin           ""
	ParIndent             ""
	TopSep                1.4
	BottomSep             0.7
	LabelType             Above
	Font
	  Size                Normal
	EndFont
	LabelFont
	  Series              Bold
	  Size                Normal
	EndFont
End


Style Bibliography
	Align                 Left
	AlignPossible         Left
	LabelFont
	  Series              Bold
	EndFont
End