Table 5: Comparison of distances within the AGN environment: object name, log ionisation parameter of each phase (log $\xi $; erg cm s$^{\rm -1}$), black hole mass ( $M_{\rm BH}$; 10$^{\rm 7}$ $M_\odot $), distance of BLR from central engine ( $r_{\rm BLR}$; pc), distance of torus from central engine ( $r_{\rm torus}$; pc), minimum distance of warm absorber from central engine ( $r_{\rm min}$; pc), maximum distance of warm absorber from central engine ( $r_{\rm max}$; pc), the ratios of the minimum and maximum distances to the BLR and torus distances respectively ( $r_{\rm min}$/ $r_{\rm BLR}$, $r_{\rm max}$/ $r_{\rm BLR}$, $r_{\rm min}$/ $r_{\rm torus}$, $r_{\rm max}$/ $r_{\rm torus}$).

Object		 log $\xi $ $M_{\rm BH}$ $r_{\rm BLR}$ $r_{\rm torus}$ $r_{\rm min}$ $r_{\rm max}$ $r_{\rm min}$/ $r_{\rm BLR}$ $r_{\rm max}$/ $r_{\rm BLR}$ $r_{\rm min}$/ $r_{\rm torus}$ $r_{\rm max}$/ $r_{\rm torus}$

MR2251-178		 2.9 0.83 a 0.027b 5.4 1.1 29 43 1100 0.21 5.3
  0.68       1.1 3000 43 110000 0.21 570
PG0844+349 3.7 2.7c 0.020c 3.0 5.9 $\times$ 10$^{\rm -5}$ 4.6 $\times$ 10$^{\rm -5}$ 0.0029 0.0023 2.0 $\times$ 10$^{\rm -5}$ 1.5 $\times$ 10$^{\rm -5}$
PG1211+143 3.4 2.36c 0.085c 2.7 0.00035 2.7$\times$ 10$^{\rm -4}$ 0.0042 0.0032 0.00013 9.8 $\times$ 10$^{\rm -5}$
  1.7       0.00035 0.0054 0.0042 0.064 0.00013 0.0020
  -0.9 2.36 0.085 2.7 - - - - - -
IRAS 13349+2438 2.25 80d 0.11e 3.3 - - - - - -
  0       39 620 350 5500 12 180
NGC 4593 2.61 0.2f 0.0076f 0.71 0.11 0.31 14 41 0.15 0.44
  0.5       0.12 40 16 5300 0.17 56
NGC 3783 1.1 1.1g 0.0038g 1.2 0.17 2.9 45 770 0.14 2.4
  2.3       0.17 0.29 45 77 0.14 0.24
  2.9       0.17 0.11 45 29 0.14 0.092
Markarian 509 1.76 9.5g 0.067g 3.6 20 180 310 2700 5.6 49
NGC 7469 2.1 0.76g 0.0042g 1.67 0.10 1.6 24 370 0.061 0.93
NGC 3516 0.78 2.3h 0.0088i 0.64 4.9 20 560 2300 7.7 31
NGC 5548 2.69 6.8g 0.015g 1.7 6.0 2.3 400 150 3.5 1.3
  1.98       3.0 4.8 200 310 1.8 2.8
  0.4       7.0 420 460 27000 4.0 240
MCG-6-30-15 1.25 1.5j 0.0068e 0.72 5.7 33 840 4800 7.9 46
  2.5       0.036 0.016 5.2 2.4 0.050 0.023
Markarian 766 0.7 1.9k 1.1e - - - - - - -
NGC 4051 1.4 0.14g 0.0054g 0.15 0.075 0.12 14 23 0.50 0.84
Ark 564 0 3.7l $\leq$0.0025m 3.9 14 9400 5600 3700000 3.6 2400
  2       14 290 5600 120000 3.6 75
a Morales & Fabian (2002); b Monier et al. (2001); c Kaspi et al. (2000b); d Brandt et al. (1997); e calculated from $L_{\rm Bol}$ as described in text; f Santos-Lleo et al. (1995); g Wandel et al. (1999); h Gebhardt et al. (2000); i Wanders et al. (1993); j Reynolds (2000); k Mathur et al. (2001); l Matsumoto et al. (2004); m Shemmer et al. (2001).


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Article Contents
1 Introduction
2 Data and analysis
3 Results and discussion
4 Conclusions
References
List of tables
List of figures