Table 6: SAC fit parameters for the permitted Fe  II narrow component lines. p ( ${\rm eV^{-1}}$), ${X}_{\rm c}$, q ( ${\rm eV^{-1}}$) and ${Y}_{\rm c}$ are fitting parameters, $\chi ^{2}$ is a measure of the fitting precision.
year 1995 1999 2001
p $1.32\pm0.33$ $1.28\pm0.23$ $0.94\pm0.31$
${X}_{\rm c}$ $-7.27\pm0.09$ $-7.52\pm0.08$ $-7.37\pm0.11$
q $1.79\pm0.19$ $1.60\pm0.16$ $1.28\pm0.17$
${Y}_{\rm c}$ $-17.00\pm0.54$ $-17.40\pm0.47$ $-18.37\pm0.47$
N lines 50 50 28
red.$\chi ^{2}$ 0.65 0.45 0.34


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