What are the line thicknesses for fractions and underlines?

Question

I need to know the thickness of certain lines in my document. In particular I want to know the thickness of the rule in a display-fraction and the thickness of an underline. I want to pass one of these values to another package so that it draws various lines with the same thickness. I think the thickness depends on the font, because stix2 has much thicker underlines compared to the default font.

wipet · Answer

The fontdimen8textfont3 is the internal font register where the rule thickness is saved. Try:
the fontdimen8textfont3 % default value of used font

$aover b$

fontdimen8textfont3=1pt

$aover b$

But LuaTeX uses another method to access such values. See section 7.4.1 of LuaTeX manual.

What are the line thicknesses for fractions and underlines?

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