Table 1: General characteristics of the data analyzed in this work. The number of detections and censored data are reported for the interesting parameters for the whole sample of objects (Cols. 2 and 3), for the Seyfert 1 galaxies (Cols. 4 and 5), and for the Seyfert 2 objects (Cols. 6 and 7). The 90% confidence interval limits were used for censored data and the detected values were defined if determined with a 99% confidence level (Dadina 2007)
Parameter Tot. Sample Seyfert 1 Seyfert 2

Det. Cens. Det. Cens. Det. Cens.

$N_{\rm H}$ 83 80 31 53 52 27

EW 129 7 66 4 63 3

R 68 18 46 9 22 9

$E_{\rm c}$ 33 51 27 26 6 25

**Table 1:** General characteristics of the data analyzed in this work. The number of detections and censored data are reported for the interesting parameters for the whole sample of objects (Cols. 2 and 3), for the Seyfert 1 galaxies (Cols. 4 and 5), and for the Seyfert 2 objects (Cols. 6 and 7). The 90% confidence interval limits were used for censored data and the detected values were defined if determined with a 99% confidence level (Dadina 2007)
Parameter	Tot. Sample	Seyfert 1	Seyfert 2
	Det.	Cens.	Det.	Cens.	Det.	Cens.
$N_{\rm H}$	83	80	31	53	52	27
EW	129	7	66	4	63	3
R	68	18	46	9	22	9
$E_{\rm c}$	33	51	27	26	6	25

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