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Variation 1:	$V = V_0\frac{e^{a_1[P]} - e^{b_1[N]}}{e^{a_1[P]} + e^{b_1[N]}}$	(Two species)
Variation 2:	$V = V_0\frac{\Sigma e^{a_i[P_i]} - \Sigma e^{b_j[N_j]}}{\Sigma e^{a_i[P_i]} + \Sigma e^{b_j[N_j]}}$	(i positive species, j negative species)
Variation 3:	$V = V_0\frac{e^{+a[S_i]} - e^{-a[S_o]}}{e^{+a[S_i]} + e^{-a[S_o]}}$	(Single species, two sides of a barrier: i (inside), o (outside) )
Variation 4:	$V = V_0\frac{e^{+a_i[S_i]} - e^{-a_o[S_o]}}{e^{+a_i[S_i]} + e^{-a_o[S_o]}}$	(Single species, two sides of a barrier: different coefficients inside and outside )