The Mopra Southern Galactic Plane CO Survey—Data Release 3

We present observations of 50 deg(2) of the Mopra carbon monoxide (CO) survey of the Southern Galactic Plane, covering Galactic longitudes l= 300-350 degrees and latitudes vertical bar b vertical bar <= 0.5 degrees. 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 clouds and gas of the Southern Galactic Plane in the 109-115 GHz J = 1-0 transitions of (CO)-C-12, (CO)-C-13, (CO)-O-18, and (CO)-O-17. We present a series of velocity-integrated maps, spectra, and position-velocity plots that illustrate Galactic arm structures and trace masses on the order of similar to 10(6) M-circle dot deg(-2), and include a preliminary catalogue of (CO)-O-18 clumps located between l= 330-340 degrees. Together with the information about the noise statistics of the survey, these data can be retrieved from the Mopra CO website and the PASA data store.