/usr/lib/R/site-library/tcltk2/Fonts.txt is in r-cran-tcltk2 1.2-11-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ### Fonts
TkDefaultFont # Default font for widgets
TkClassicDefaultFont # Classic default font
### GUI elements
TkMenuFont # Menus
TkIconFont # Icon labels
TkCaptionFont # Windows caption
TkSmallCaptionFont # Small windows captions
TkHeadingFont # Column headers
TkStatusFont # Status bar
TkTooltipFont # Tooltips
### Text
TkBigTitleFont # A big title
TkTitleFont # A title
TkTextFont # Usual text (read on screen)
TkTextStrongFont # Usual text strong (usually bold)
TkTextEmphFont # Usual text emphasize (usually italic)
TkFixedFont # Non prop text (code, ...)
TkFixedStongFont # Non prop text strong (usually bold)
TkFixedEmphFont # Non prop text emphasize (usually italic)
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