#StackBounty: #symbols #mtpro #math-fonts #newtxmath Problem with scale of imported glyphs

Bounty: 50

Traying to obtain the Times 4-Line Mathematics used in old math books of Springer (and many other scientific textbooks) I downloaded the mtpro2 lite package. However, this package doesn’t include a varg option, like newtxmath, as far as I know.

So, following Egreg’s answers and, I have imported the glyphs varg, varv and varw to my document.

The problem is that it seems they are quite smaller than the mtpro2 fonts:

enter image description here

The following image corresponds to the Springer’s book of Morris W Hirsch Differential Topology:

enter image description here

Certaily, the glyph looks different, but the main problem I see is that the varg and especially varv seem quite smaller; in my opinion the $x$ is quite taller.

Do you know a way to correct that? I thought in using the package newtxmath instead of mtpro2 and import the z glyph (with the upright base). The problem is that I would have to change also the italic z in normal text.

Here I attach the mwe:

documentclass{article}
usepackage[scaled=0.92]{helvet}    % set Helvetica as the sans-serif font
renewcommand{rmdefault}{ptm}      % set Times as the default text font
usepackage[lite,subscriptcorrection,slantedGreek,nofontinfo]{mtpro2}

%var letters
DeclareFontFamily{U}{ntxmia}{skewcharfont=127 }
DeclareFontShape{U}{ntxmia}{m}{it}{
  <-> ntxmia
}{}
DeclareFontShape{U}{ntxmia}{b}{it}{
  <-> txbmia
}{}
DeclareSymbolFont{ntxmia}{U}{ntxmia}{m}{it}
SetSymbolFont{ntxmia}{bold}{U}{ntxmia}{m}{it}
DeclareMathSymbol{varg}{mathord}{ntxmia}{49}
DeclareMathSymbol{varv}{mathord}{ntxmia}{51}
DeclareMathSymbol{varw}{mathord}{ntxmia}{52}
AtBeginDocument{mathcode`g=varg}
AtBeginDocument{mathcode`v=varv}
AtBeginDocument{mathcode`w=varw}


begin{document}

[
gxv qquad {(x,g(x)):xin U} qquad v(x)
]

end{document}

Thanks in advance and happy new year.


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