depth,age,n2,chla,zone
0,2011,4.882423276,0.097214166,2
0.25,2010,3.158193256,,2
0.5,2009,4.260276831,,2
0.75,2008,3.7074027,,2
1,2007,3.2433148,0.13744833,2
1.25,2002,2.870062321,,2
1.5,1997,4.979674797,,2
1.75,1993,3.948046925,,2
2,1988,3.907745311,0.05612553,2
2.25,1980,3.793274292,,2
2.5,1973,4.308525605,,2
2.75,1966,4.032258065,,2
3,1958,4.369382223,0.013674751,1
3.25,1954,5.348877827,,1
3.5,1949,4.28711416,,1
3.75,1945,3.206806283,,1
4,1940,3.908742821,0.008303176,1
4.25,1935,3.463191225,,1
4.5,1930,5.187600576,,1
4.75,1926,4.811846964,,1
5,1921,5.526481999,0.006615748,1
5.5,1909,4.911000641,,1
6,1898,4.585267256,0.006580953,1
7,1876,5.128527171,0.005092693,1
8,,,0.004846768,
9,1833,5.499685732,0.00564379,1
9.5,1822,5.836668573,,1
10,,,0.008170309,
12,,,0.006854311,
14,,,0.008654185,
16,,,0.012118436,
18,,,0.016727302