sorry i guess i didn't do the math. i thought you were confusing the mu symbol with nanograms.

truly they need to provide the statistical precision of their measurements - you may actually have a legitimate case to claim to them of mislabeling

and i need to read more thoroughly before commenting!

i recall once a friend had me realize how meaningless all the digits of pi really are when you consider the scale as you have done here, in most cases only a few digits are really meaningful at all (and perhaps explains how fractional approximations were acceptable enough in antiquity)