lat      lon       date_local  depth  chl_a  chl_a_stdev  NH4  NH4_stdev  NO3   NO3_stdev  NO2  NO2_stdev  Urea  Urea_stdev  PO4  PO4_stdev  SiO4  SiO4_stdev  
77.6167  165.4744  2013-01-16  3      0.4    0.1          1.3  0.1        10.0  0.0        0.1  0.0        0.5   0.0         0.9  0.0        66.9  6.6         
74.6445  164.8316  2013-01-22  3      1.2    0.0          2.9  0.0        6.6   0.5        0.1  0.0        0.8   0.0         0.6  0.0        33.3  0.3         
77.8365  166.4143  2014-12-23  1      3.7    1.4          1.4  0.1        29.3  0.1        BD   nd         0.3   0.0         1.8  0.1        69.5  6.6         
77.6180  165.4056  2014-12-29  5      2.4    0.2          1.0  0.0        20.9  0.1        BD   nd         0.2   0.0         1.4  0.0        69.6  0.6         
77.6180  165.4056  2015-01-06  5      2.5    0.4          0.8  0.2        8.5   0.1        BD   nd         0.2   0.0         0.8  0.0        68.5  2.3         
77.6190  165.4133  2015-01-15  5      2.4    0.1          1.0  0.0        11.3  0.0        BD   nd         0.3   0.0         0.9  0.0        64.4  0.3         
77.6190  165.4133  2015-01-23  5      1.0    0.2          0.8  0.1        12.0  0.0        BD   nd         0.2   0.0         0.9  0.0        66.2  0.5