depth,age,n2,chla,zone
0,2010,4.803921569,0.019934103,3
0.25,2008,5.224326169,,3
0.5,2005,5.395049767,,3
0.75,2003,6.201903605,,3
1,2000,7.025693967,0.002049608,3
1.25,1994,7.707310935,,2
1.5,1988,7.184750733,,2
1.75,1981,7.906286304,,2
2,1975,7.393771125,0.001061262,2
2.25,1956,7.481372908,,2
2.5,1937,7.550542406,,2
2.75,1918,7.943198029,,2
3,1899,6.805555556,0.000834574,2
3.25,1879,7.024082569,,1
3.5,1860,7.144523504,,1
3.75,1841,7.171291418,,1
4,1822,7.258829106,0.000903856,1
4.25,1803,6.801021541,,1
4.5,1784,6.822992091,,1
4.75,1765,7.232258826,,1
5,1746,5.443476715,0.000580498,1
5.25,1727,5.796347118,,1
5.5,1708,6.483539748,,1
5.75,1689,7.16374269,,1
6,1669,8.277027027,0.000686414,1
6.25,1650,6.571888412,,1
6.5,1631,6.322254335,,1
6.75,1612,5.199932083,,1
7,1593,5.998433062,0.000358324,1
7.25,1574,6.052969661,,1
7.5,1555,6.761231924,,1
7.75,1536,5.763620965,,1
8,1517,6.971318006,0.000272522,1
8.25,1498,6.011384827,,1
8.5,1479,6.855831654,,1
8.75,1460,6.550802139,,1
9,,,0.000425151,
10,,,0.000758413,