Table 9: SAC fit parameters for the [Fe II] narrow components. q (eV^-1) and Y_f are fitting parameters. ${\overline {Y}}$ is Y_f corrected for q at a mean 3 eV excitation potential. $\log\overline{N}({\rm H})$ is the logarithm of the total number of Hydrogen atom in the emitting volume.
year 1995 1999 2001

q
$0.44\pm0.05$ $0.47\pm0.05$ $0.57\pm0.08$

$Y_{{\rm f}}$ $-15.51\pm0.16$ $-15.41\pm0.13$ $-15.20\pm0.25$

${\overline {Y}}$ -16.83 -16.82 -16.91

T_f $11~500\pm1000$ $10~ 500 \pm 1000$ $9000\pm2000$

$\log\overline{N}({\rm H})$ $49.9\pm.2$ $50.0\pm.1$ $50.2\pm.3$

N lines 85 80 31

red. $\chi ^{2}$ 0.68 0.82 0.94

**Table 9:** SAC fit parameters for the [Fe II] narrow components. q (eV^-1) and Y_f are fitting parameters. ${\overline {Y}}$ is Y_f corrected for q at a mean 3 eV excitation potential. $\log\overline{N}({\rm H})$ is the logarithm of the total number of Hydrogen atom in the emitting volume.
year	1995	1999	2001
q	$0.44\pm0.05$	$0.47\pm0.05$	$0.57\pm0.08$
$Y_{{\rm f}}$	$-15.51\pm0.16$	$-15.41\pm0.13$	$-15.20\pm0.25$
${\overline {Y}}$	-16.83	-16.82	-16.91
T_f	$11~500\pm1000$	$10~ 500 \pm 1000$	$9000\pm2000$
$\log\overline{N}({\rm H})$	$49.9\pm.2$	$50.0\pm.1$	$50.2\pm.3$
N lines	85	80	31
red. $\chi ^{2}$	0.68	0.82	0.94

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