event  cast  cycle  date      event_lat  event_lon   depth  sample  nitrate     NO3_uptake  
304    25    2      07042010  9.03513    -90.56236   2      4-1     2.306267    0.291130    
304    25    2      07042010  9.03513    -90.56236   12     4-2     2.548288    0.314226    
304    25    2      07042010  9.03513    -90.56236   20     4-3     17.560737   0.139562    
304    25    2      07042010  9.03513    -90.56236   30     4-4     25.750825   0.076889    
304    25    2      07042010  9.03513    -90.56236   40     4-5     29.842224   0.047126    
304    25    2      07042010  9.03513    -90.56236   50     4-6     31.825592   0.040384    
304    25    2      07042010  9.03513    -90.56236   60     4-7     32.548972   0.035156    
304    25    2      07042010  9.03513    -90.56236   80     4-8     33.558309   0.033409