[NTG-context] scaling externalfigure in metafun

[Nigel King]

I apologize in advance for asking what I am sure is a repeated question 
but I cannot find the answer in manuals and archives.

In Metafun externalfigure "file.pdf" xyscale(x,y) ; how does one find 
the size of a graphic in order to scale it appropriately

TIA
--
Nigel
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