Table 2. Summary of the visual system comparisons that generated the largest differences, based on the lowest Pearson’s r value, in the mean dichromatism scores of 70 species of the Order Galliformes.

Parameter	Eye type	Conditions	Pearson’s r	Equal rank	Rank change	Rank SD	Max change
Light environment	UVS	Ideal vs D65	0.9991	30	1.03	1.57	10
	VS	Ideal vs D65	0.9994	36	0.77	1.23	8
Photoreceptor λmax	UVS	All Max vs All Min	0.9986	27	1.03	1.20	5
	VS	All Max vs All Min	0.9963	17	1.54	1.71	9
Oil droplet cut-off value	UVS	R Min vs All Max	0.9979	27	1.00	1.13	6
	VS	R Max vs All Min	0.9947	21	1.26	1.20	5
Ocular media T50 values	UVS	T314 vs T344	0.9998	45	0.51	0.85	4
	VS	T335 vs T395	0.9991	28	1.06	1.46	9
Photoreceptor densities	UVS	A. minutus vs P. pacificus	0.9791	8	3.11	2.87	12
	VS	A. minutus vs P. pacificus	0.9846	6	2.63	2.07	10
Model systems	-	Average UVS vs Average VS	0.9929	15	2.34	2.66	16
	-	P. cristatus vs S. vulgaris	0.9881	8	3.00	3.06	16

Values reported describe how many species (out of 70) were assigned the same rank in the comparison (Equal rank), the average rank change (Rank change), the standard deviation of rank change (Rank SD), and the maximum rank change (Max change). See Materials and Methods, Results, and Supporting Information sections for more details.