DOY_UTC	Day of the Year (UTC)
Lat	Latitude (N)
Lon	Longitude (W)
track_dist_km	Distance (km)
track_dist_coast_km	Distance from coast (km)
bathy_depth_m	Bottom depth (m)
#profile	Profile number
fish_depth_m	supersucker depth (m)
fish_alt_m	supersucker altitude from bottom (m)
pressure_dbar	pressure (dbar)
T0	Temperature (C)
S0	Salinity
sig0	density anomaly (kg m-3)
O2_µM	Dissolved oxygen (µM)
beamC_m^-1	beam attenuation (m-1)
NH4_µM	ammonium (µM)
NO3_µM	nitrate + nitrite (µM)