Notes. N(H₂) is derived using N(HCO⁺); N(H₂) = N(HCO⁺)/ 3 × 10⁻⁹ for a case with N(HCO⁺) < 2.8 × 10¹² cm⁻², N(H₂) = N(HCO⁺)/2 × 10⁻⁸ for a case with N(HCO⁺) > 9.4 × 10¹³ cm⁻², and an interpolated value between these two ranges of N(HCO⁺), log(N(H₂)) = log(N(HCO⁺))×1.64. The column densities derived for each species toward the remaining sources is tabulated in Appendix B. The velocity intervals are defined, based on HCO⁺ absorption line profiles. ^(a)Refers to the velocity intervals corresponding to molecular gas components associated with the background continuum sources, and thus the derived column densities of these velocity intervals indicate lower limits. ^(b)Indicates the N(H₂) for the velocity intervals belonging to the GC region where likely have higher X(HCO⁺) (>3.9 × 10⁻⁹ for the central molecular zone Riquelme et al. 2018) than the Galactic disk regions.