Column density maps of molecular hydrogen in the direction of HESS J1702-420, obtained by integrating the brightness temperature profile of ¹²CO(J = 1 → 0) data from the Mopra radio survey within the velocity intervals indicated above each panel (corresponding to the peaks in Fig. H.3). The brightness temperature values were converted to H₂ column density assuming the conversion factor X_CO = 1.5 × 10²⁰ cm⁻² (K km s⁻¹)⁻¹ (Strong et al. 2004). The green (orange) contours indicate the 5 and 12σ (3 and 5σ) significance levels of the TeV γ-ray flux above 2 TeV (40 TeV). The dashed ellipse and solid circle represent the 1σ morphologies of HESS J1702-420B and HESS J1702-420A, respectively. Finally, the red square – centered at the best-fit position of HESS J1702-420A – indicates the extraction region used to produce the profile reported in Fig. H.3.