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(<i>C</i>/pF), log(<i>τ</i>/ms), <i>E</i> (mV), <i>V</i>_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.