date      lat       lon       sta       depth     N2_fix_no_prefilter  N2_fix_no_prefilter_stderr  N2_fix_10um_prefilter  N2_fix_10um_prefilter_stderr  N2_fix_gt_10um_fraction  activity_and_comments  
20070812  23.841    -159.239  5         5         0.22                 0.13                        0.27                   0.17                          0.00                     nd                     
20070812  23.841    -159.239  5         25        0.26                 0.06                        0.04                   0.04                          0.22                     nd                     
20070812  23.841    -159.239  5         45        0.17                 nd                          nd                     nd                            nd                       prefilter data omitted due to mechanical analysis error  
20070812  23.841    -159.239  5         75        0.03                 0.03                        0.00                   0.00                          0.03                     nd                     
20070812  23.841    -159.239  5         100       0.00                 nd                          0.01                   0.00                          0.00                     nd                     
20070812  23.841    -159.239  5         125       0.01                 0.01                        0.00                   0.00                          0.01                     nd                     
20070817  23.18     -159.277  19        5         1.28                 0.16                        0.51                   0.12                          0.77                     nd                     
20070817  23.18     -159.277  19        25        0.95                 0.15                        0.44                   0.10                          0.52                     nd                     
20070817  23.18     -159.277  19        45        1.02                 0.26                        0.42                   0.10                          0.60                     nd                     
20070817  23.18     -159.277  19        75        0.27                 0.03                        0.13                   0.04                          0.14                     nd                     
20070817  23.18     -159.277  19        100       0.08                 0.08                        0.01                   0.01                          0.07                     nd                     
20070817  23.18     -159.277  19        125       0.01                 0.01                        0.04                   0.04                          0.00                     nd