Jean-Marc Lasgouttes wrote:
> You can take the width of the 'm' letter, which was the original
> definition. 

'M' (capital), for that matter. However, this never was the original 
definition. The original definition refers to the height of the body (the 
metal block of the letter). 

> I read somewhere it is not really true, but it might be 
> good enough.

for a start:
http://en.wikipedia.org/wiki/Em_(typography)

Jürgen

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