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Undocumented function to determine em-width of font in points (or mm)

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Dear all
I vaguely remember that there is an undocumented function for 
extracting the length of an em in the current font, and expressing it 
in printers points, but I can't remember what it was.

My problem is I need to create a graphics output that is a guaranteed 
absolute width in points (or mm). Each row in the grid needs to take 
its natural height, which GraphicsGrid or GraphicsColumn does not do 
(it creates equal-height rows). So I need to use Grid. But unlike 
GraphicsGrid, which uses points in the ImageSize option, Grid uses ems 
in the ItemSize option. I have a standard font so I should be able to 
map the font em to absolute units like points or mm, if only I can 
extract that em length in absolute units.

Does anyone either remember the name of the undocumented function, or 
have another suggestion on how to do this?

I am trying to write some functions to output various grids of plots, 
with titles and footnotes over the whole grid of plots. The formatting 
requirements of my employer are very, very precise. I can replicate the 
one-panel graphs pixel-for-pixel, but not when there is a grid of plots 
under the same title.

Thanks in advance,
Luci

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Undocumented function to determine em-width of font in points (or mm) Luci Ellis <luci@verbeia.com> - 2011-05-07 11:36 +0000
  Re: Undocumented function to determine em-width of font in points (or mm) Luci Ellis <luci@verbeia.com> - 2011-05-08 11:35 +0000
  Re: Undocumented function to determine em-width of font in points (or mm) Armand Tamzarian <mike.honeychurch@gmail.com> - 2011-05-09 10:20 +0000

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