function del = deleq(T,S)
% USAGE: del=deleq(T,S)
% Benson and Krause eqn. to compute delHe3 at equilibrium at temperature T degC and salinity S per mille.

% Samar Khatiwala (spk@ldeo.columbia.edu)

del =  -1.804 + (8.5e-3*T) + (2e-6*(T.^2)) - (8e-4*S);
