Left: line intensities of ¹²CO(1 − 0) and ¹²CO(2 − 1) for quiescent late-type spirals (Böker et al. 2003, open squares) and those with low-luminosity AGN (filled squares, this work). Right: I₂₁/I₁₀ ratio vs. I₁₀, indicating the elevated line ratio for NGC 1042 and NGC 4395. Here, the error bars for the comparison sample are not shown for clarity. The horizontal lines indicate the mean value of I₂₁/I₁₀ (solid) and the mean  ± 1σ (dashed) for the comparison sample.