The Mopra Southern Galactic Plane CO Survey – data release 4– complete survey

Abstract We present observations of the Mopra carbon monoxide (CO) survey of the Southern Galactic Plane, covering Galactic longitudes spanning $l = 250^{\circ}$ ( $-110^{\circ}$ ) to $l = 355^{\circ}$ ( $-5^{\circ}$ ), with a latitudinal coverage of at least $|b|<1^\circ$ , totalling an area of $>$ 210 deg $^{2}$ . These data have been taken at 0.6 arcmin spatial resolution and 0.1 km s $^{-1}$ spectral resolution, providing an unprecedented view of the molecular gas clouds of the Southern Galactic Plane in the 109–115 GHz $J = 1-0$ transitions of $^{12}$ CO, $^{13}$ CO, C $^{18}$ O, and C $^{17}$ O.