Table 7: Optical and UV magnitudes.

Source		 Filter ($\lambda$) Observed De-reddened De-reddened
    magnitude magnitude (SMC)a magnitude (X-ray)b

NGC 1692		 U (3440 Å) 16.4 16.2 13.1
  UVW1 (2910 Å) 19.4 19.1 16.0
  UVM2 (2310 Å) >22.0 >21.6 >18.5

PKS 0625-35		 U (3440 Å) 15.9 15.6 15.0
  UVW1 (2910 Å) 15.7 15.3 14.7
  UVM2 (2310 Å) 15.8 15.2 14.6

3C 88c		 U (3440 Å) 18.6 18.0 18.1
  UVW1 (2910 Å) 18.6 17.8 18.0
  UVM2 (2310 Å) 18.6 17.4 17.6

3C 444		 U (3440 Å) 19.4 19.3 18.7
  UVW1 (2910 Å) 19.2 19.0 18.5
  UVM2 (2310 Å) 19.6 19.4 18.8
a Magnitude de-reddened using a SMC-type extinction law (see text for details). b Magnitude de-reddened using a reddening $A(V)/N_{\rm H}=5.3\times 10^{-22}$ with $N_{\rm H}$ derived fromthe X-ray spectral fitting. c For 3C 88 only the U filter yielded a value for the magnitude. The same magnitude was used for the other 2 filters to allow a direct comparison with the other targets.

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