depth,age,n2,chla,zone
0,2009,6.867361812,0.043487501,2
0.25,2002,7.644782826,,2
0.5,1994,8.312975027,,2
0.75,1987,8.647465763,,2
1,1979,8.440126774,0.025840255,2
1.25,1963,7.456781105,,2
1.5,1947,8.547306726,,2
1.75,1931,7.09076175,,2
2,1915,6.632376827,0.017852283,2
2.25,1896,7.096512571,,2
2.5,1877,8.445945946,,2
3,1839,9.185662867,0.017467794,2
3.5,1801,8.376641138,,2
4,1763,4.781420765,0.02192105,1
4.5,1725,4.47080292,,1
5,,,0.021541645
6,,,0.019926653
7,,,0.021652688
8,,,0.024075307
9,,,0.02510077
10,,,0.025086528
11,,,0.02400975