Table 2. Parameters used to generate data shown in Fig 2 (single pathway optimal nonlinearities).

		low noise SNR = 5	medium noise SNR = 1	high noise SNR = 0.1
upstream noise dominant	σup	0.375	0.92	3.1
	κ	10-3	10-3	10-3
	σdown	0.05	0.05	0.05
Poisson noise dominant	σup	0.05	0.05	0.05
	κ	0.0395	0.5	6.6
	σdown	0.05	0.05	0.05
downstream noise dominant	σup	0.05	0.05	0.05
	κ	10-3	10-3	10-3
	σdown	0.135	0.4175	1.54