Table 1.

Best-fit parameters and AIC of candidate models

	Model 1	Model 2	Model 3	Model 4	Model 5
	Cardinal (vector-sum; C1)	Cardinal (scalar-sum; C2)	Perceptual (P)	Mixed model (ω P + (1-ω) C1)	Mixed model (ω P + (1-ω) C2)
Number of fitting parameters	2	2	1	4	4
Orientation of longer axis (deg)	0 or 90 (fixed)	0 or 90 (fixed)	61.03 (fixed)	(fixed)	(fixed)
Aspect ratio	1.09	1.14	2.05 (fixed)	1.01 (C1)	1.03 (C2)
Perceptual model weight (ω)	—	—	—	0.54	0.59
Goodness of fit (%)	90.78	91.30	80.72	93.20	94.37
AIC	−32 651.35	−33 346.74	−23 800.42	−36 295.08	−38 564.17