Velocity channel maps of HCO⁺ from 6.5 km s⁻¹ until 14.5 km s⁻¹. The velocity difference between the channel maps is 1 km s⁻¹. Each channel map has different color scales and shows emission stronger than a 10 σ_rms. The flux scale per velocity channel map is varied to better highlight the individual emission features. The black and white contours are the mm and cm continuum emission, respectively, and the contour levels are the same as in Fig. 3. The pink sold lines and dashed lines at velocities from 6.5 km s⁻¹ to 10.5 km s⁻¹ show the outlines of the cavity created by the HII region of DR18-05. The blue ellipses marked at velocities from 10.5 km s⁻¹ to 12.5 km s⁻¹ and the red ellipses marked at velocities of 11.5 km s⁻¹–14.5 km s⁻¹ are indicated to blue and red-shifted lobes of the potential outflow (or jet) candidate, respectively. In the 12.5 km s⁻¹ channel map, the blue cross symbols mark the positions of the extracted HCO⁺ and H¹³CO⁺ spectral lines (shown in Fig. 11) toward compact features.