, H. Liszt
Institut de Radioastronomie Millimétrique,
300 Rue de la Piscine,
F-38406 Saint Martin d'Hères,
France
National Radio Astronomy Observatory,
520 Edgemont Road,
Charlottesville, VA,
USA 22903-2475 
3mm absorption line profiles of 
CO , HCO
,
and HCN in local gas seen toward the extragalactic continuum sources
0212+735, 0355+508 (NRAO150), and 2200+420 (BL Lac ). The HCO
and HCN
profiles are remarkable in having more and wider lines than CO seen in
emission and absorption (Figs. 3 and 4). The
relative molecular abundances vary widely. For 11 velocity components
we find <N(HCO
)
;
<N(
CO )/N(HCO
)
, ranging from 
50 to 1400;
<N(
CO )/N(HCN)
, ranging from 
50 to 300;
<N(HCN)/N(HCO
)
, ranging from 0.28 to 4.7. 
Figure: Emission and absorption profiles toward 0212+735 (see
Section 2). The channel spacing is 0.26 kms
; the resolution of the
absorption profiles is 0.47 kms
Figure: Profiles toward 0355+508, as in Figure 3.