Spectrum (mass %)

N

Si

Mg

P

Ca

Ca:P atom %

Ca:P mass%

Node 1

nd

nd

nd

8.7

16.2

1.56

1.88

Node 2

1.8

0.1

0.3

8.5

15.8

1.55

1.87

Stump 1

4.1

0.2

1.9

2.5

3.6

1.2

1.45

Stump 2

3.6

1.4*

0.3

2.8

4.6

1.36

1.64

Stump 3

3.6

1.4*

0.3

2.9

4.7

1.36

1.64