tissue d13C d15N Lens -20.55871632 4.93 Lens -17.89339711 6.63 Lens -19.90471647 6.195353206 Lens -19.52990372 7.550464333 Lens -19.73400349 6.604908028 Lens -18.320331 4.565601717 Lens -19.4665861 8.052881195 Lens -19.62437014 6.841777958 Lens -19.09381063 5.928236315 Lens -20.50548348 6.567303142 Lens -18.03310536 9.62120258 Muscle -18.71 7.37 Muscle -18.42 7.71 Muscle -18.93 7.14 Muscle -18.46 8.17 Muscle -19.65 8.03 Muscle NA NA Muscle NA NA Muscle NA NA Muscle NA NA Muscle NA NA Muscle NA NA