No.

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

No. 1

No. 3

No. 4

1

1.15

1.14

1.15

2

1.15

1.11

1.13

3

1.16

1.15

1.11

4

1.09

1.13

1.09

5

1.10

1.12

1.10

6

1.10

1.12

1.09

7

1.12

1.12

1.10

8

1.14

1.14

1.14

9

1.10

1.14

1.12

10

1.09

1.11

1.16

1.11 ± 0.02

1.13 ± 0.02

1.12 ± 0.02