Panel (a): Channel maps of G107.50 + 4.47 HCO⁺ (1-0) lines from −4.73 km s⁻¹ to 0.53 km s⁻¹. Panel (b): Channel maps of G107.50 + 4.47 H¹³CO⁺ (1-0) lines from −4.49 km s⁻¹ to 0.90 km s⁻¹. Panel (c): The 450 μm and 850 μm continuum data from SCUBA-2, superposed on the HCO⁺ channel maps (velocities are −2.76, −2.10, and −0.79 km s⁻¹, respectively. The green circles denote Class 0/I YSOs from AllWISE data.).