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

e = (AF^.5)/2000; %calculation for e