| IZ | $@ SiO sub 3$ |
|---|---|
| micromole/kg | |
| 3.0 | 0.1 |
| 4.0 | 0.1 |
| 5.0 | 0.2 |
| 6.0 | 0.2 |
| 7.0 | 0.9 |
| 8.0 | 1.2 |
| 9.0 | 5.9 |
| 10.0 | 5.7 |
| 11.0 | 6.6 |
| 12.0 | 7.0 |
| 13.0 | 6.7 |
| 14.0 | 6.6 |
| 15.0 | 6.4 |
| 16.0 | 6.4 |
| 17.0 | 6.4 |
| 18.0 | 6.5 |
| 19.0 | 6.3 |
| 20.0 | 6.3 |
| 21.0 | 6.3 |
| 22.0 | 6.3 |
| 23.0 | 6.4 |
| 24.0 | 6.5 |
| 25.0 | 6.9 |
| 26.0 | 7.3 |
| 27.0 | 7.8 |
| 28.0 | 8.0 |
| 29.0 | 8.5 |
| 30.0 | 9.1 |
| 31.0 | 9.7 |
| 32.0 | 10.3 |
| 33.0 | 10.5 |
| 34.0 | 10.6 |
| 35.0 | 11.1 |
| 36.0 | 11.0 |
| 37.0 | 11.2 |
| 38.0 | 11.2 |
| 39.0 | 11.1 |