tokens: This paper made use of the following ALMA data: ADS/JAO.ALMA 2011.0.00902.S and 2013.1.01004.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The 2011.0.00902.S data was obtained by N.M.M. while she was a Master student at National Tsing Hua University, Taiwan, under the supervision of S.P.L. The authors thank J. C. Mottram for his help in using RATRAN; and M. Hogerheijde for permission to use the 2D version of RATRAN. Astrochemistry in Leiden is supported by the Netherlands Research School for Astronomy (NOVA), by a Royal Netherlands Academy of Arts and Sciences (KNAW) professor prize, and by the European Union A-ERC grant 291141 CHEMPLAN. This work is supported by grant 639.041.335 from the Netherlands Organisation for Scientific Research (NWO) and by the Netherlands Research School for Astronomy (NOVA) and by the Space Research Organization Netherlands (SRON). S.P.L. acknowledges support from the Ministry of Science and Technology of Taiwan with Grants MOST 102-2119-M-007-004-MY3.
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