function cla = clong(AF, m)
%clong(AF, m)	Determines c for the long angle factors
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%AF = age factor = agefact(age)
%m = pigmentation parameter (see pigment)
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%Based on Ijspeert, et al. 1992.
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%SEE: c3calc, c4calc, cshort


cla = (1 / ( (1 + ((m^-1) / AF)))); %clong calculation