event  cast  cycle  date      event_lat  event_lon   depth  sample  nitrate     NO3_uptake  
1047   78    5      07222010  9.15131    -87.88936   2      18-1    1.925657    0.195920    
1047   78    5      07222010  9.15131    -87.88936   12     18-2    1.928255    0.157590    
1047   78    5      07222010  9.15131    -87.88936   20     18-3    2.837240    0.256099    
1047   78    5      07222010  9.15131    -87.88936   30     18-4    17.110519   0.164916    
1047   78    5      07222010  9.15131    -87.88936   40     18-5    19.784071   0.160852    
1047   78    5      07222010  9.15131    -87.88936   50     18-6    21.159419   0.169825    
1047   78    5      07222010  9.15131    -87.88936   70     18-7    28.379853   0.198520    
1047   78    5      07222010  9.15131    -87.88936   100    18-8    29.485700   0.201455