On Wed, Jan 16, 2019 at 4:24 PM Wolfgang Schuster
<wolfgang.schuster.li...@gmail.com> wrote:
> > % Which factor should I use to match \tfxx?
> > \symbol[ShortForty]
> > \scale[factor=4]{\symbol[ShortForty]}
> x = 0.8
> xx = 0.6

That's what the ConTeXt Reference Manual also says, but that doesn't
seem to match what ConTeXt does. The 'x' ratio is 0.835 and the 'xx'
ratio is 0.6667. The 'm' ratio is 0.802 and the 'n' ratio is 0.601,
which is "close enough".

\definefontsize[m]
\definefontsize[n]

\setupbodyfontenvironment
  [default]
  [m=0.8,
   n=0.6,
  ]

\starttext
{\tfx m}{\tfm m}m
{\tfxx m}{\tfn m}m

\setbox\scratchbox\hbox{m}
\the\ht\scratchbox
\setbox\scratchbox\hbox{\tfx m}
\the\ht\scratchbox
\setbox\scratchbox\hbox{\tfxx m}
\the\ht\scratchbox

\setbox\scratchbox\hbox{m}
\the\ht\scratchbox
\setbox\scratchbox\hbox{\tfm m}
\the\ht\scratchbox
\setbox\scratchbox\hbox{\tfn m}
\the\ht\scratchbox
\stoptext
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