Amount ng/spot

Mean Area

S.D.

% R.S.D.

Intra-day precision*

600

9450.9

33.80

0.35

800

11388.8

121.23

1.06

1000

13256.2

104.73

0.79

Inter-day precision*

600

9437.56

25.41

0.26

800

11397.43

50.97

0.44

1000

13215.27

56.51

0.42