Integrated (220–250 km s^-1) intensity map of [N ii] (colors), convolved to 50′′ angular resolution, overlayed with the contours of [C ii] at 20′′ resolution. Blue asterisks show the positions where spectra have been extracted for Fig. 13. The inserted spectrum shows the [N ii] emission averaged in the area marked by the blue box (x-axis is Velocity [km s^-1] and y-axis is T_mb [K]).