Total intensity map of the blueshifted (left) and redshifted (middle) high-velocity CO(3−2) emission in ALMA observations of NGC 3256. The velocity range of the integrated CO(3−2) emission is given in the plots. Overlaid are thick black contours of the broad-component H₂ flux from Fig. 1 (levels from 14% to 80% in steps of 13% of the peak flux), as well as thin gray contours of the 343 GHz radio continuum from the ALMA data (levels at 3 and 10 mJy beam^-1; for details see Sakamoto et al. 2014). The relative astrometry between the SINFONI and ALMA data has an estimated uncertainty of ~ 0.5′′. Right: position-velocity (PV) diagram of the high-velocity CO(3−2) emission along a north-south direction crossing the secondary nucleus at offset = 0″ (optical velocity definition; contours 20, 40, 60, 80, 100 mJy beam^-1). Overlaid are black symbols that represent the broad-component H₂ emission along the same direction (i.e., the NS-aperture from Fig. 1); the box shows the range between the average and maximum value per resolution element (1.1′′ × 0.25′′), while the error bars indicate ± 0.5 × FWHM_average. The complex region of the main CO disk is not discussed (see Sakamoto et al. 2014).