tokens: This work was supported by Australian Research Council grants ( DP0662810, DP1096533 ). The Mopra Telescope is part of the Australia Telescope and is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. The University of New South Wales Mopra Spectrometer Digital Filter Bank used for these Mopra observations was provided with support from the Australian Research Council, together with the University of New South Wales, University of Sydney, Monash University and the CSIRO. We would like to thank the anonymous referee whose comments served to increase the quality of our manuscript and maximize the exploitation of our data.
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