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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: typearea
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At 20:06 19/01/2004, you wrote:

> > 
> \edef\layoutratio{\withoutpt{\the\dimexpr(2\paperheight/(\paperwidth/32768))}}
>
>Very strange, it works, but I don't understand how 2 * a / (b / 32768) == a/b

one can divide a dimen by a dimen in which case the dimen is cast on a 
counter (internally a dimen is just a number, with a sp unit); we need to 
compensate by 64K then; i multiply by two first to get rid of inaccuracy 
etc etc

>Do I understand it right, backspace is the inner margin, and cutspace the
>outer one?  Are both needed?

no, but it permits width=middle

Hans