¹²CO(1–0) average spectra for the observed galaxies. Top row, from left to right in alphabetical order of name: CGCG 007−025, Mrk 996, and NGC 1140. Second row: NGC 1156, NGC 3353 (Haro 3) two pointings ([0, 0], [0, +10′′]. Third row: NGC 3353 third pointing [–6′′, –9′′]), NGC 7077 (Mrk 900), UM 448. Bottom row: UM 462. The baselines are shown as a horizontal solid line, together with the multiple-component Gaussian fits as described in Sect. 3.2. The vertical axes are in units, while in Table 2 the units are T_mb, converted from as described in the text. Velocity channels are as reported in Table 2.