Notes. The reported values are relative to the ¹²CO J = 1–0 line transition and represent averages obtained over the entire extension of each individual cloud. The detailed analysis of the spectral characteristics of the molecular gas is presented in Sect. 5.2. Columns (1)–(2): velocity intervals and names corresponding to the CO clouds identified in this work. For reference, see Fig. 7. Column (3): kinematic distances to each cloud computed from CO and H i line emission and absorption spectra. The atomic and molecular data come from the VGPS and FUGIN surveys, respectively. Columns (4)–(6): peak intensity (T_peak), line-of-sight velocity (υ_LSR), and line width (full width at half maximum, Δυ_FWHM), respectively. Velocity measurements have a mean associated error of 7.6 km s⁻¹, as explained in Sect. 2.2. The reported estimates were calculated by fitting Gaussian functions to the CO-H i spectra. Column (7): average dimensions (height × width) of each CO cloud. Columns (8)–(9): molecular hydrogen column density and total mass (M_tot) of the clouds. Both magnitudes were calculated using expressions given in Sect. 2.2. The mean percentage error in our estimates of NH₂ and Mtot are, respectively, ~35% and ~50% (for the interacting clouds); see discussion in Sect. 5.2. Column (10): number density of the molecular hydrogen computed from the expression by assuming a path length along the line of sight, L, equivalent to the mean linear size of each cloud listed in Col. (7). The error in is typically 40%. Column (11): classification of the physical association between the SNR G46.8–0.3 and the discovered CO clouds based on the analysis presented in Sect. 5 of this work.