Table 10: Fitting parameters of ionisation-parameter distributiona.
Galaxy Data points $\delta $ $\log U_{0}$
NGC 7212 4 -0.43 $\pm$ 0.08 -2.1
NGC 1386 6 -0.58 $\pm$ 0.03 -2.7
a A linear least-squares fit was applied with $\log~$ $U_{\log~(n_{\rm e}) = 2, \rm obs}$ = $\delta \cdot \log R/R_0 + \log~$U0. U0 corresponds to the value at R0 = 100 pc distance from the centre. The number of data points included in the fit is given in column 2 (= half the number of averaged values from both sides of the nucleus). For NGC 1386 which shows a transition between line ratios typical for AGNs and H II-regions, only data points within the NLR were included. For ESO 362-G008, too few data points were available for a fit. For NGC 3281 and IC 5063, no fit was applied as the ionisation parameter does not peak in the centre. For NGC 5643, the [O II] line was not covered by the observations.

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