The line-of-sight velocities of NH₃ (J,K) = (1,1) (squares) and HC₃N J = 2−1 (triangles) at different radial distances along the perpendicular diagonal cuts of the molecular core L1517BC (panels a) and b)), and along three points of L1400K (panel c)) shown in Fig. 1. The origin of coordinates is (Δα,Δδ) = (0′′,0′′) in each panel. The radial distances of the points from the circular sector with the central angle 0° ≤ ψ < 180° are positive, whereas those from the sector 180° ≤ ψ < 360° are negative. For multiple observations at the same coordinate the mean values of V_lsr are depicted. The error bars show the 1σ uncertainties.