Left panel: ¹²CO(1–0) integrated spectrum and Gaussian fit (red) in the inner  ~ 2″ of NGC 3627 for PdBI+30 m combined data. The Gaussian fit shows that the heliocentric systematic velocity is redshifted by 16 km s^-1 with respect to the heliocentric velocity of the center (0 km s^-1). Right panel: same for ¹²CO(2–1). The Gaussian fit shows that the heliocentric systematic velocity is redshifted by 18 km s^-1.