Notes. Listed items (The full table is available at the CDS): (1) Galaxy labels for different observational regions, as shown in Fig. 3. The bold name indicates companion galaxies or locations off the main disc, as listed in Table 2. (2) d denotes the projected distance to the galaxy’s minor axis. (3), (5), (7) The integrated line intensities for the ¹²CO J = 1 − 0, ¹³CO J = 1 − 0, and ¹²CO J = 2 − 1 lines, corrected for main beam and forward efficiencies. If the lines were not firmly detected, we list the 3σ upper limit and use ‘–’ in the velocity column and other parameter calculations. (4), (6), (8) The centroid velocities were derived from the intensity-weighted average velocity of the Gaussian components. (9), (10) The intensity line ratios of ¹²CO J = 1 − 0 to ¹³CO J = 1 − 0, and ¹²CO J = 2 − 1 to ¹²CO J = 1 − 0 were corrected for beam dilution as discussed in Sect. 2.2. (11), (12) τ(¹³CO) and T_K represent the optical depth and kinetic temperature, respectively, under LTE. The uncertainties only account for the statistical errors from the measurements.