No.

The atomic fraction of the isotope carbon-13, calculated by the formula

No. 8

No. 4

1

1.13

1.75

2

1.12

1.81

3

1.10

1.90

4

1.12

1.82

5

1.10

1.81

6

1.13

1.75

7

1.14

1.78

8

1.10

1.83

9

1.12

1.84

10

1.13

1.76

1.12 ± 0.02

1.81 ± 0.04