Atom Isotope Relative atomic mass % isotopic composition Pi projection residue and Pi mass value Pi-mass NPI(m) = N.Pi/10 Error EPI(m,N)
Oxygen Average
% balance
15.9994(3) - 0.686647751  0.685840735 -1 0.000807016
  O16 15.994 914 619 56(16) 0.997 57(16) 0.692662834
0.685840735
-1 0.006822099
  O17 16.999 131 70(12) 0.000 38(1) 0.354913152
0.371681469
-2 0.016768318
  O18 17.999 161 0(7) 0.002 05(14) 0.022742056
0.000000000
0 0.022742056
Notes: 0.685840735 = 1 – Pi/10, 0.371681469 = 1 – 2Pi/10
Table 3: Example of Pi-mass projection fine-tuned selectivity for Oxygen average mass vs. individual isotopes