Extracted spectra of HCO⁺ (1-0) and H¹³CO⁺ (1-0) from the mapping images. The selected positions are where the asymmetry of the line profiles are obvious (the extraction point coordinates and line-profile types are marked on the upper left corner of each figure). The green line is the result of Gaussian fitting of H¹³CO⁺ (1-0) and the dashed red line indicates the central radial velocity of H¹³CO⁺ (1-0) (If H¹³CO⁺ emissions are not detected, we use C¹⁸O data to track the central radial velocity). The HCO⁺ (1-0) profiles are evaluated: B denotes a blue asymmetric double-peaked profile, P-S denotes a peak-shoulder profile, S denotes a single-peaked profile with the peak skewed to the blue, R denotes a red profile, and N denotes a symmetric line profile or multi-peaked profile.