| IT | Silicate |
|---|---|
| months since 1960-01-01 | micro mole/L |
| 1-15 Nov 1996 | 31.6 |
| 16-30 Nov 1996 | 33.8 |
| 1-15 Dec 1996 | 3.0 |
| 16-30 Dec 1996 | 32.2 |
| 1-15 Jan 1997 | 17.2 |
| 1-15 Feb 1997 | 28.0 |
| 16-30 Feb 1997 | 23.3 |
| 1-15 Mar 1997 | 12.5 |
| 1-15 Apr 1997 | 34.2 |
| 1-15 May 1997 | 29.2 |
| 16-30 May 1997 | 54.0 |
| 1-15 Jun 1997 | 20.7 |
| 16-30 Jun 1997 | 11.5 |
| 1-15 Jul 1997 | 23.8 |
| 16-30 Jul 1997 | 29.9 |