---

pr : pressure [dbars]
de : depth [meters]
te : in situ temperature [degrees C]
th : potential temperature: pref= 0. [degrees C]
sa : salinity [psu]
ox : oxygen [ml/liter]
o2 : oxygen [micromole/kg]
n2 : nitrite [micromole/kg]
n3 : nitrate [micromole/kg]
p4 : phosphate [micromole/kg]
si : silicate [micromole/kg]
ht : dynamic height [dyn. meters (= *10 m**2/s**2)]
pe : potential energy anomaly [10**6 g/sec**2 (ergs/cm**2)]
s0 : potential density: pref = 0. [kg/m**3]
s1 : potential density: pref = 1000. [kg/m**3]
s2 : potential density: pref = 2000. [kg/m**3]
s3 : potential density: pref = 3000. [kg/m**3]
s4 : potential density: pref = 4000. [kg/m**3]
s_ : potential density: pref = ?. [kg/m**3]
bf : buoyancy frequency [* 1.e-5 radians/sec]
pv : potential vorticity [* 1.e-12 m^-1 sec^-1]
sv : specific volume [* 1.e-8 m**3/kg]
va : specific volume anomaly [* 1.e-8 m**3/kg]
f1 : freon-11 [picomole/kg]
f2 : freon-12 [picomole/kg]
he : helium [micromole/kg]
tu : tritium [tritium units]
gn : neutral density (gamma-n) [kg/m**3]
ge : gamma-n errorbar [kg/m**3]