HC₃N-line integrated intensity maps for different velocity ranges (indicated at the bottom of each panel). Row 1 shows the transition J = 12–11 with E_up = 34.1 K. The interval between contours is 4 K km s^-1 and the lowest contour is 2 K km s^-1. Row 2 shows the transition J = 26–25 with E_up = 153.3 K. The interval of contours is 7 K km s^-1 and the lowest contour is 3 K km s^-1. The white plus indicates the position of the hot core and the black cross the position of the compact ridge. The beam size is also shown with a blue circle.