¹²CO(1−0) (left) and ¹²CO(2−1) (right) emission line spectra for three bulgeless spiral galaxies containing an AGN: NGC 1042 (top), NGC 4178 (middle), and NGC 4395 (bottom). The velocity resolution for all spectra is 5.2km   s^-1. The horizontal lines in each panel indicate the HI line width at 20% level (W₂₀, dashed) and the range over which the derived CO line intensities of Table 2 were integrated (solid). Also shown are Gaussian fits to the line profiles which yield an alternative estimate for the line intensities.