Distribution of the NH₃(1,1) line velocities derived from Gaussian fits to the hyperfine structure. Top: the radial velocity map. The V_LSR values can be read from the contours and the colour bar on the right. The locations of the Spitzer 24 μm source and the submm source Cha-MMS1a are shown with a triangle and a plus sign, respectively. Middle: velocity profile along the NW-SE oriented axis drawn in yellow on the map, Bottom: velocity profile along the NE-SW oriented axis indicated with green. Also the error bars result from Gaussian fits to the (1,1) hyperfine structure.