Table 1. Forms and degrees of heterogeneities introduced in the CAN model of grid cell activity.

Degree of heterogeneity	Intrinsic heterogeneity (${\displaystyle \tau }$)		Afferent heterogeneity (${\displaystyle \alpha }$)		Synaptic heterogeneity (${\displaystyle W_{ij}}$)
	Lower bound	Upper bound	Lower bound	Upper bound	Lower bound	Upper bound
1	8	12	35	55	0	300
2	6	14	25	65	0	600
3	4	16	15	75	0	900
4	2	18	5	85	0	1200
5	1	20	0	100	0	1500