Table 5: Results of correlation tests between spectropolarimetric indices, p0 and three indices derived from optical spectra. $P_{\tau }$ and $P_{r_{\rm s}}$ give the probabilities that the correlation between the two indices are due to chance. n is the number of points considered for the correlation. A correlation is emphasized if $P \leq 0.05$. The last column gives the sign of the correlation.
Index 1 Index 2 $P_{\tau }$ $P_{r_{\rm s}}$ n  
p0 $p_{\rm e}/p_{\rm c}$ C IV 0.067 0.091 17 -
p0 $p_{\rm e}/p_{\rm c}$ C III] 0.147 0.167 19 -
p0 SI 0.224 0.254 15 +
p0 $p_{{\rm max}}$ 0.029 0.019 22 +
$p_{\rm e}/p_{\rm c}$ C IV $p_{\rm e}/p_{\rm c}$ C III] 0.012 0.018 17 +
$p_{\rm e}/p_{\rm c}$ C IV SI 0.440 0.647 13 -
$p_{\rm e}/p_{\rm c}$ C IV $p_{{\rm max}}$ 0.966 0.936 17 +
$p_{\rm e}/p_{\rm c}$ C IV BI 0.523 0.583 17 -
$p_{\rm e}/p_{\rm c}$ C IV DI 0.579 0.640 17 +
$p_{\rm e}/p_{\rm c}$ C IV $\alpha _B$ 0.797 0.763 17 +
$p_{\rm e}/p_{\rm c}$ C III] SI 0.553 0.714 15 -
$p_{\rm e}/p_{\rm c}$ C III] $p_{{\rm max}}$ 0.823 0.777 19 -
$p_{\rm e}/p_{\rm c}$ C III] BI 0.970 0.951 19 +
$p_{\rm e}/p_{\rm c}$ C III] DI 0.852 0.913 19 +
$p_{\rm e}/p_{\rm c}$ C III] $\alpha _B$ 0.823 0.775 19 -
SI $p_{{\rm max}}$ 0.959 0.947 15 -
SI BI 0.919 0.914 15 +
SI DI 0.033 0.073 15 -
SI $\alpha _B$ 0.203 0.221 15 +
$p_{{\rm max}}$ BI 0.008 0.004 22 +
$p_{{\rm max}}$ DI 0.080 0.093 22 -
$p_{{\rm max}}$ $\alpha _B$ 0.089 0.059 22 +


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