Table 3. Covariance (upper triangle and diagonal) and Spearman’s rank correlation (lower triangle only as diagonals would be unity) of the appropriately transformed Exponential Integrate-and-Fire model parameters log(C/pF), log(τ/ms), E (mV), V _T (mV) and log(Δ_T/mV) for each of the four cell classes.

The transformed parameters have normal marginal distributions and the combined sets satisfy at least one test for multivariate normality at the 5% level (see main text). All values are given to two significant figures.

	Layer 2/3					Layer 4
	log(C)	log(τ)	E	V T	log(ΔT)	log(C)	log(τ)	E	V T	log(ΔT)
log(C)	0.066	−0.012	0.0047	−0.55	−0.012	0.083	0.0078	0.25	−0.25	−0.010
log(τ)	−0.41	0.029	−0.099	0.28	−0.028	0.19	0.058	0.28	−0.0045	−0.0066
E	0.11	−0.22	18	7.8	−0.071	0.20	0.067	18	5.1	−0.38
V T	−0.48	0.35	0.38	15	−0.42	−0.14	−0.025	0.29	12	−0.38
log(ΔT)	0.13	−0.43	−0.0016	−0.39	0.13	−0.13	−0.014	−0.30	−0.47	0.071
Slender-tufted layer 5						Thick-tufted layer 5
log(C)	0.063	0.022	0.49	−0.15	−0.02	0.075	0.004	0.16	−0.28	−0.021
log(τ)	0.34	0.065	0.28	−0.031	−0.019	0.031	0.052	0.070	−0.0054	−0.017
E	0.49	0.14	17	5.9	−0.65	0.16	0.066	16	5.3	0.22
V T	−0.22	−0.086	0.35	13	−0.18	−0.33	0.088	0.29	13	0.25
log(ΔT)	−0.20	−0.21	−0.23	−0.039	0.13	−0.20	−0.070	0.18	0.27	0.13