All Figures

Figure 1: Absorption profiles toward NGC 1052. The data are presented as scaled, offset, line/continuum ratios. The H I and OH profiles at top are the "total'' VLB profiles from Vermeulen et al. (2003) representing spatially-resolved data averaged over some 15-20 mas or 1.5-2.0 pc at one epoch. Profiles of the J=1-0 transitions of HCN, HCO+ and CO from the Plateau de Bure represent data taken at multiple epochs against the vastly-unresolved mm-wave continuum, whose spatial distribution is compact and probably similar to that at lower frequencies, but with a larger contribution from regions at smaller radii (see Sect. 3.1 of the text).

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In the text

	Figure 2: CO J=3-2 emission and various absorption profiles toward Centaurus A. The CO is the centermost profile in the study of Liszt (2001). The H I is from Sarma et al. (2002), OH from van Langevelde et al. (1995) and HCO+ from Wiklind & Combes (1997).
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In the text

	Figure 3: OH and HCO+ optical depths for galactic diffuse and translucent clouds, and elliptical galaxy lines of sight. The qualifications "lo'' and "hi'' in NGC 1052 and Cen A refer to the velocity ranges defined in Tables 1-2.
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In the text