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I want to use the font Fira Sans for my document, but this font has only "old-style" numbers. I was wondering if it was possible to change only the numbers' font so it would be different from the alphabetical characters.

I searched a lot but all answers I could find would only change the font in math mode using \DeclareMathSymbol, I want this modification to affect all the document.

Thank you.

PS: I realize I could just use another font which has regular numbers, but I want to know (no matter the extra work) if its feasible.

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    Welcome to TeX.SX! If I call \usepackage[sfdefault,lining]{FiraSans}, the numbers are lining. – egreg Sep 6 '15 at 22:28
  • And the opentype font supports at least 4 different styles of figures: oldstyle, lining, proportional and tabular (2x2). The FiraSans package also supports the 2x2 set of possibilities. – cfr Sep 7 '15 at 1:17
  • The solutions by @egreg sets the lining (proportional, ...) style of figures for the whole document. Is there an easy way to change the lining of the math mode only - to retain readability throughout the text, but align numbers within specific equations? – tipavi Jan 16 '18 at 13:14
  • @tipavi In unicode-math, you can \setmathfont[range=up/Digits, Numbers={Lining, Proportional}, Scale=MatchUppercase]{Fira Sans}. You could also try the experimental Fira Math font. – Davislor May 16 '19 at 18:43
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With XeLaTeX and fontspec it's fairly easy :

\usepackage{fontspec}
\setmainfont[]{Fira Sans}
\setmathrm[]{Anotherfont}

Or you could check your font and the doc of Fontspec to edit \setmathrm[]{Fira Sans} with the adequate options if it's available.

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