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diff --git a/fonts/plex/latex/plex-serif.sty b/fonts/plex/latex/plex-serif.sty
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+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{plex-serif}
+ [2019/04/23 (Bob Tennent) Style file for IBMPlexSerif fonts]
+
+\RequirePackage{ifxetex,ifluatex,xkeyval,textcomp}
+
+\newif\ifplexserif@otf
+\ifxetex
+ \plexserif@otftrue
+\else\ifluatex
+ \plexserif@otftrue
+\else % [pdf]LaTeX
+ \plexserif@otffalse
+\fi\fi
+
+
+\newcommand*{\IBMPlexSerif@scale}{1}
+\DeclareOptionX{scale}{\renewcommand*{\IBMPlexSerif@scale}{#1}}
+
+
+\DeclareOptionX{type1}{\plexserif@otffalse}
+
+\DeclareOptionX{thin}{\edef\mdseries@rm{ul}\def\plexserif@medstyle{Thin}}
+\DeclareOptionX{t}{\edef\mdseries@rm{ul}\def\plexserif@medstyle{Thin}}
+\DeclareOptionX{extralight}{\edef\mdseries@rm{el}\def\plexserif@medstyle{ExtraLight}}
+\DeclareOptionX{el}{\edef\mdseries@rm{el}\def\plexserif@medstyle{ExtraLight}}
+\DeclareOptionX{light}{\edef\mdseries@rm{l}\def\plexserif@medstyle{Light}}
+\DeclareOptionX{l}{\edef\mdseries@rm{l}\def\plexserif@medstyle{Light}}
+\DeclareOptionX{text}{\edef\bfseries@rm{text}\def\plexserif@boldstyle{Text}}
+\DeclareOptionX{tx}{\edef\bfseries@rm{text}\def\plexserif@boldstyle{Text}}
+\DeclareOptionX{textmd}{\edef\mdseries@rm{text}\def\plexserif@medstyle{Text}}
+\DeclareOptionX{txmd}{\edef\mdseries@rm{text}\def\plexserif@medstyle{Text}}
+\DeclareOptionX{medium}{\edef\bfseries@rm{mb}\def\plexserif@boldstyle{Medium}}
+\DeclareOptionX{m}{\edef\bfseries@rm{mb}\def\plexserif@boldstyle{Medium}}
+\DeclareOptionX{semibold}{\edef\bfseries@rm{sb}\def\plexserif@boldstyle{SemiBold}}
+\DeclareOptionX{sb}{\edef\bfseries@rm{sb}\def\plexserif@boldstyle{SemiBold}}
+
+\ProcessOptionsX\relax
+
+\ifplexserif@otf
+ \RequirePackage{fontspec}
+ \def\plexserif@medstyle{Regular}
+ \def\plexserif@boldstyle{Bold}
+\else % type1
+ \RequirePackage{fontenc,fontaxes,mweights}
+ \def\bfseries@rm{b}
+ \def\mdseries@rm{m}
+ \fa@naming@exception{figures}{{superior}{proportional}}{Sup}
+ \fa@naming@exception{figures}{{superior}{tabular}}{Sup}
+ \def\sufigures{\@nomath\sufigures
+ \fontfigurestyle{superior}\selectfont}
+ \DeclareTextFontCommand{\textsu}{\sufigures}
+ \let\textsuperior\textsu
+\fi
+
+\ifplexserif@otf
+ \def\plexserif@regular{Regular}
+ \ifxetex\XeTeXtracingfonts=1\fi
+ \defaultfontfeatures{
+ Ligatures = TeX ,
+ Scale = \IBMPlexSerif@scale ,
+ Extension = .otf }
+ \setmainfont
+ [ UprightFont = *-\plexserif@medstyle ,
+ ItalicFont = *-\ifx\plexserif@medstyle\plexserif@regular
+ Italic
+ \else\plexserif@medstyle Italic\fi ,
+ BoldFont = *-\plexserif@boldstyle ,
+ BoldItalicFont = *-\plexserif@boldstyle Italic ]
+ {IBMPlexSerif}
+ \newfontfamily\plexserif
+ [ UprightFont = *-\plexserif@medstyle ,
+ ItalicFont = *-\ifx\plexserif@medstyle\plexserif@regular
+ Italic
+ \else\plexserif@medstyle Italic\fi ,
+ BoldFont = *-\plexserif@boldstyle ,
+ BoldItalicFont = *-\plexserif@boldstyle Italic ]
+ {IBMPlexSerif}
+
+\else % type1
+ \def\plexseriffamily{IBMPlexSerif-TLF}
+ \newcommand*\plexserif{\fontfamily{\plexseriffamily}\selectfont}
+ \def\rmdefault{\plexseriffamily}
+ \def\seriesdefault{\mdseries@rm}
+\fi
+
+\ifplexserif@otf
+ % turn off defaults in case other fonts are selected:
+ \defaultfontfeatures{}
+\fi
+
+\endinput