Velocity map of the narrow-blue component, with N(H₂ ) obtained from Herschel observations overlaid as dashed black contours. The contour levels indicate N(H₂) = 1.2 × 10²²,1.3 × 10²²,1.5 × 10²², 1.8 × 10²² cm⁻². The red contour shows the boundary of the coherent core from single-component fits. The beam and scale bar are shown in the bottom left and the bottom right corners, respectively.