What is ulp?

see http://en.wikipedia.org/wiki/Unit_in_the_last_place to find if it is the answer you want. or ftp://ftp.inria.fr/INRIA/publication/publi-pdf/RR/RR-5504.pdf see http://en.wikipedia.org/wiki/Unit_in_the_last_place to find if it is the answer you want. or ftp://ftp.inria.fr/INRIA/publication/publi-pdf/RR/RR-5504.pdf