1	function signal = eq_binding(Et, Lt, Kd, signal, gain, c)
2	%binding equilibrium E + L < = > EL; simulate signal proportional to [EL]
3	%<gfitModelDescription version=“100”>
4	%variable	type	minVal	startVal	unit	comment
5	% Et	()	0	1	uM	‘total concentration of E’
6	% Lt	independent	0	1	uM	‘total concentration of L’
7	% Kd	para	0	0.1	uM	‘dissociation constant’
8	% signal	dependent	()	()	()	‘complex formation’
9	% gain	para	()	1	()	‘signal gain’
10	% c	para	()	0	()	‘signal background’
11	%
12	%variable	size	plotVs
13	% Et	Lt	()
14	% signal	Lt	Lt
15	%</gfitModelDescription>
16	EL = (Kd + Et + Lt - sqrt((Kd + Et + Lt). ˆ2 - 4 * Et.* Lt))/2;
17	signal = c + gain * EL;