This is an extremely good point and I need to contact the authors of this article who first used the Nonsymmetry coefficient and determine the correct usage. I guess the reason I assumed multiplication is because the value of fcc at (tau_max - tau) over the period of the integration can result in a lot of values that cannot be evaluated because tau_max - tau will be negative (egs. fcc(-10 usec)) and the correlation fx produced I believe starts at time = 0 and proceeds positively). What do you think? But I will contact them.
Sincerely, Don
