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tokens: We thank Matthew S. Povich for his valuable constructive comments that have improved the presentation of the paper. S.O. is financially supported by a Research Fellowship from the Japan Society for the Promotion of Science for Young Scientists. H.V. C. acknowledges financial support from MOST 105-2119-M-007-022-MY3 grant, Taiwan. G.B. acknowledges the support of the Spanish Ministerio de Economia y Competitividad (MINECO) under the grant FPDI- 2013-18204. G.B. is also supported by the Spanish MINECO grant AYA2014-57369-C3-1-P. A.P. appreciates insightful discussions with Enrique Vázquez-Semadeni and Javier Ballesteros-Paredes. A.P. acknowledges financial support from UNAM-DGAPA-PAPIIT IA102815 grant, México. This paper makes use of the ALMA data: ADS/JAO.ALMA 2013.1.00312.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. Data analysis was carried out on a common use data analysis computer system at the Astronomy Data Center, ADC, of the National Astronomical Observatory of Japan. Facility: No:ALMA .