All Figures

	Figure 1: Spectra of the BL Lacs observed with the ESO 3.6 m and the NOT 2.5 m telescopes. Top panel: flux calibrated spectra. Bottom panel: spectra normalized with respect to the continuum. Telluric bands are indicated by , spectral lines are marked by the line ID, and absorption features from atomic species in the interstellar medium of our galaxy are labeled by ISM.
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In the text

	Figure 1: continued.
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In the text

	Figure 1: continued.
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In the text

	Figure 1: continued.
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In the text

Figure 2: The environment of 1H 0323+22. In the main panel (ESO 3.6 m raw image, 10 s exposure), the companion galaxy G1 is labeled. The subpanel in the lower right hand corner (R-band image, adapted from Falomo 1996) shows a higher resolution image of the BL Lac. The nucleus surrounded by the host galaxy is apparent, together with the compact knot G2. The angular separation between the nucleus and G2 is 2.6''.

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In the text

	Figure 3: Spectra of the companion objects of 1H 0323+22. Top panel: G1; second panel: G2 (before decontamination); third panel: spectrum of the BL Lac, taken with an aperture symmetric to G2; bottom panel: G2 (decontaminated spectrum).
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In the text

Figure 4: The environment of 1ES 1440+122. In the main panel (R-band image taken at the NOT by R. Falomo), the locations of galaxies G1 and G2 and the nucleus (A+B) are indicated. Subpanel: HST detail of the region around the BL Lac (filter F702W image from Scarpa et al. 1999); A is the BL Lac nucleus, B is a foreground star (see Giovannini et al. 2004). The angular separation between A and G2 is 2''. North and East directions are indicated by the arrow.

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In the text

	Figure 5: Spectra of the companion galaxies G1 ( top) and G2 ( bottom) of 1ES 1440+122.
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In the text