function b = bcalc(AF)
%bcalc(AF)	calculates a constant used in determining the B1 and B2 variables.
%
%AF = agefactor = agefact(age)  (age in years)
%
%From Ijspeert, 1992.
%
%SEE: B1calc, B2calc, agefact.

b = (9000-(936*(AF^.5))); %equation for b calculation