Differential LOSV map . The major axis of the primary (thin line) and the secondary bar (thick line) are overplotted. The isovelocity contours are superimposed for 0, 20, and 40  km  s^-1 in black and for − 20, − 40, and − 60  km  s^-1 in red. The spatial extend of the KDC is given by its circular structure. Within the KDC, the underlying gas disk is counter-rotating with respect to the large scale gas distribution outside of the KDC.