Centroid velocity map overlaid with the velocity gradient (after subtracting the average overall velocity gradient) arrows. The subregions where a second velocity component is seen are excluded from the maps. The directions of the arrows point to the steepest velocity field change in the redshifted direction, while the arrow lengths represent the relative vector magnitudes of the gradient, with the length of 3 km s⁻¹ pc⁻¹ indicated in each subplot. The magenta arrow shows the average overall velocity gradient across the core; the length is artificially scaled up by a factor of ten for better representation. The contour levels indicate N(NH₃) starting from 1.0 × 10¹⁴ cm⁻² with an interval of 2.1 × 10¹⁴ cm⁻².