event  cast  cycle  date      event_lat  event_lon   depth  sample  nitrate     NO3_uptake  
1077   82    5      07232010  9.3092     -87.70677   2      19-1    1.692032    0.177351    
1077   82    5      07232010  9.3092     -87.70677   12     19-2    1.778933    nd          
1077   82    5      07232010  9.3092     -87.70677   20     19-3    2.777780    0.086832    
1077   82    5      07232010  9.3092     -87.70677   30     19-4    20.584091   0.201147    
1077   82    5      07232010  9.3092     -87.70677   40     19-5    21.624577   0.200435    
1077   82    5      07232010  9.3092     -87.70677   50     19-6    25.617238   0.240586    
1077   82    5      07232010  9.3092     -87.70677   70     19-7    30.159670   0.319282    
1077   82    5      07232010  9.3092     -87.70677   100    19-8    27.928646   0.275342