> Remember tfm metrics are not perfect. There are only 16 possible
> values for depth or height, and one of these is required to be 0.
> So in a font with many different glyph sizes the tfm file has
> already done some kind of grouping operation which can lose a lot of
> information.
Whatever the TeX height and depth values look like, they should be
exactly represented in the OpenType font -- remember that those values
are *completely independent* from the real glyph shape. Replacing
them with bbox values is not possible.
Werner
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