25

3.13

13.12

8.75

5.03

0.3112

1.40

25

4.38

13.12

7.5

7.04

0.3734

1.57

25

5.68

13.12

6.2

9.13

0.4553

0.87

25

6.88

13.12

5

11.06

0.5222

0.93

25

8.13

13.12

3.75

13.07

0.5797

1.04

25

9.38

13.12

2.5

15.08

0.6326

0.88

25

10.63

13.12

1.25

17.09

0.6773

0.73

25

11.88

13.12

0

19.10

0.7091

0.74

25

0

13.12

11.88

0.00

-0.0002

1171

40.2

ppm

when y=0, x is 0.161ppm

Take into account dilution factor, so multiply by 25/13.12