def compSig(nSoma, nDend)
	a1 = 87.01;
	a2 = 68.24;
	a3 = 71.71;
	a4 = 10.5;
	b1 = 28.5;
	b2 = 164.7;
	b3 = 64.97;
	b4 = -12.63;
	M = a1 + a2/(1+exp(-(nDend-a3)/a4));
	T = b1 + b2/(1+exp(-(nDend-b3)/b4));
	outFreq = M/(1+exp(-(nSoma-T)));
	return outFreq