>> OK. However, this doesn't seem to scale properly within the same font
>> … try the following:
>>
>> ---
>> \edef\defaultrulethickness{\the\fontdimen8\textfont3}
>
> That is because of the \edef. Changing to a plain \def should help:
>
>   \def\defaultrulethickness{\the\fontdimen8\textfont3\relax}

Yep, works!

What's the correct way of piping this to MetaFun? Putting

DefaultRuleThickness := \defaultrulethickness;

into each "\startuseMPgraphic{}" block works, but how can I define  
this globally? Moving it into "\startMPinclusions" creates a scope  
problem … see also the other thread about BodyFontSize etc.

Thanks for your help,
Oliver
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