tokens: Acknowledgements We thank the anonymous referee for very helpful comments and suggestions. The ASTE project is led by Nobeyama Radio Observatory (NRO), a branch of National Astronomical Observatory of Japan (NAOJ), in collaboration with University of Chile and Japanese institutes including University of Tokyo, Nagoya University, Osaka Prefecture University, Ibaraki University, Hokkaido University and the Joetsu University of Education. The INT is operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. SP, MO and AP are members of the Carrera del investigador científico of CONICET, Argentina. MCP is a doctoral fellow of CONICET, Argentina. This work was partially supported by grants awarded by CONICET, ANPCYT and UBA (UBACyT) from Argentina. AP acknowledges support from the Varsavsky Foundation. MR acknowledges support from FONDECYT(CHILE) grant No. 1140839. SP and AP are grateful to Dr Takeshi Okuda for the support received during the ASTE observations.
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