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Re: large bigops

>I would guess that the height values used were
>an expedient forced by the Metafont limit of 15 heights and depths per
>.tfm file. 

Hmm... I don't think so.  There's only 13 distinct depths in cmex10,
so DEK could have used another one for the big operators such as

>This hypothesis seems to be supported by the use of the
>padded operator in bigop.mf for the displaystyle versions.

I think the padding must be in there for some other reason.  Perhaps
DEK wanted scripts to be placed slightly further away on the bigops...
It does look pretty deliberate though...