Um, yes it does matter. You do realize that businesses get sued because they don't fulfill six-nines availibility? A change in rate of 10^-6 is extremely import

Um, yes it does matter. You do realize that businesses get sued because they don't fulfill six-nines availibility? A change in rate of 10^-6 is extremely important, especially in the geomagnetic fields where the rotation of the inner core needs to be precisely measured.