Continuum-free CO(1–0) line intensity map of 4C12.50, displayed for ~114 km s^-1 bins (in the range −315 km s^-1 to 369 km s^-1). The number in the upperleft corner of each frame corresponds to the bin mean velocity. Contours are plotted at integer multiples of the 5σ level for these images, i.e., in steps of 2.4 mJy/beam. A shift toward the west of the line peak position from negative to positive velocities, as well as a distinct kinematic component near rest-frame velocity are observed.