My apology, ULP stands for "Unit in the Last Place". The simple explanation is that an ULP is defined as the difference between two consecutive floating point

My apology, ULP stands for "Unit in the Last Place". The simple explanation is that an ULP is defined as the difference between two consecutive floating point numbers, which means it isn't a fixed value. Another "intuitive" explanation, is that if you increment the binary representation of a float, the difference between the two numbers is 1 ULP. (I'd explain more, but I have to run to a meeting! More info on Wikipedia: https://en.wikipedia.org/wiki/Unit_in_the_last_place https://en.wikipedia.org/wiki/Unit_in_the_last_place)