event  cast  cycle  date      event_lat  event_lon   depth  sample  nitrate     NO3_uptake  
732    57    4      07152010  8.54411    -90.39998   2      12-1    1.597655    nd          
732    57    4      07152010  8.54411    -90.39998   12     12-2    1.618619    0.083612    
732    57    4      07152010  8.54411    -90.39998   20     12-3    7.027533    0.030373    
732    57    4      07152010  8.54411    -90.39998   30     12-4    18.548121   0.040380    
732    57    4      07152010  8.54411    -90.39998   40     12-5    26.858866   0.086011    
732    57    4      07152010  8.54411    -90.39998   50     12-6    29.984136   0.001224    
732    57    4      07152010  8.54411    -90.39998   60     12-7    31.498496   0.039346    
732    57    4      07152010  8.54411    -90.39998   80     12-8    32.416235   0.033803