Analytical flags:
NO_DATA - No data available at depth from which site water for incubation was collection
NO_REPS - Measurement was not replicated
BDL - Below the detection limit (3 * standard deviation of 7 low standards)
MEAN_SITE_APN - see APN_Flag below

Columns:
Project - Project ID
CollectionType - How the sample was collected i.e., from Niskin bottles affixed to the CTD rosette (CTD) or from the pump profiling system (PPS)
CollectDate - Date of sample collection
Sta - Station ID
Lat - Decimal degrees latitude
Lon - Decimal degrees longitude
Depth_m - Water column depth from which sample was collected (m)
SeafloorDepth_m - Depth of water column at given station (m)
EuphoticDepth_m - Depth of euphotic zone (0.1% sPAR) (m)
O2_umolkg - Dissolved oxygen concentration (umol O2 kg^-1)
Temp_C - Temperature (degrees C) at depth from which sample was collected
Sal - Salinity at depth from which sample was collected
PC_conc_uM - Particulate carbon concentration (uM)
NO2_uM - Nitrite concentration (uM)
NO3+NO2_uM - Nitrate + nitrite concentration (uM)
SRP_uM - Soluble reactive phosphorus concentration (uM)
NFR_nmolNLd - Mean N2 fixation rate of replicate incubations (nmol N L^-1 d^-1)
NFR_sd - Standard deviation of N2 fixation rates from replicate incubations (nmol N L^-1 d^-1)
LOD_nmolNLd - Mean limit of detection for replicate 15N2 incubations
LOQ_nmolNLd - Mean limit of quantification for replicate 15N2 incubations
Inc_count - Total number of replicate 15N2 incubations
ADL_count - Total number of replicate incubations where the calculated N2 fixation rate was above the detection limit
NFR_ADL - Boolean value indicating whether N2 fixation was detected (TRUE), i.e., whether ADL_count >= 2, or was not detected (FALSE)
APN_Flag - 'MEAN_ODZ_APN' or 'MEAN_ABOVE_APN' indicates that the mean PN isotopic enrichment (APNt=0) within either suboxic or oxic waters, respectively, was used to calculate the N2 fixation rate (instead of using a measurement from the exact depth from which incubation water was collected); this occurred because many of the direct APNt=0 samples collected were low mass (<10 ug N on a filter) and isotopic enrichment values were consequently discarded as untrustworthy