ner_tags: O O O O O O O O O O O O O O O O O O O O O O O B-Person I-Person O B-Person I-Person O O O O O O O O O O O O O O O O B-Person I-Person O O O O O O O O O O O O O O O O O B-Person I-Person I-Person O O O O O O O O O O O O O B-Observatory O B-Identifier O B-Identifier B-Observatory O O O O B-Observatory O O O O B-Organization B-Location O B-Organization B-Location O O B-Organization B-Location B-Organization O B-Organization B-Location O B-Organization B-Location I-Location I-Location O O O O B-Location I-Location I-Location O B-Observatory I-Observatory I-Observatory O O O B-Observatory B-Organization O B-Observatory O O O B-Person O O O O B-Grant B-Organization I-Organization I-Organization B-Organization O O O B-Grant O B-Grant I-Grant I-Grant I-Grant O O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization O O O O B-Organization I-Organization I-Organization I-Organization B-Person O O O O O O B-Fellowship I-Fellowship I-Fellowship I-Fellowship O O B-Fellowship B-Person O O O O B-Organization I-Organization I-Organization I-Organization B-Organization B-Grant I-Grant I-Grant O B-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship O O B-Fellowship I-Fellowship I-Fellowship I-Fellowship O O O O O O B-Archive I-Archive I-Archive I-Archive O B-Database O O O B-Organization B-Location I-Location O B-Citation I-Citation I-Citation I-Citation O O O O O O B-Software O O O O O O O B-Software O B-Citation I-Citation I-Citation O B-Software O B-Citation I-Citation I-Citation I-Citation O B-Software O B-Citation I-Citation I-Citation I-Citation I-Citation I-Citation O O B-Software O B-Citation I-Citation O
tokens: Acknowledgements The authors wish to thank the anonymous referee for the constructive comments that significantly improved the paper. The authors are grateful to Brett McGuire and Roman Motiyenko for providing the line strengths of CH 3 OCH 2 OH spectroscopic data. The authors acknowledge Gleb Fedoseev for the valuable discussion about the desorption temperatures from the TPD experiments of the O-bearing COMs and Troels C. Petersen for discussions of the statistical methods. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2012.1.00712.S and ADS/JAO.ALMA#2013.1.00278.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. The group of J.K.J. acknowledges support from the H2020 European Research Council (ERC) (grant agreement No 646908) through ERC Consolidator Grant “S4F”. Research at Centre for Star and Planet Formation is funded by the Danish National Research Foundation. A.C. postdoctoral grant is funded by the ERC Starting Grant 3DICE (grant agreement 336474). M.N.D. is supported by the Swiss National Science Foundation (SNSF) Ambizione grant 180079, the Center for Space and Habitability (CSH) Fellowship and the IAU Gruber Foundation Fellowship. This research has made use of NASA’s Astrophysics Data System and VizierR catalogue access tool, CDS, Strasbourg, France ( Ochsenbein et al. 2000 ), as well as community-developed core Python packages for astronomy and scientific computing including Astropy ( Astropy Collaboration 2013 ), Scipy ( Jones et al. 2001 ), Numpy ( van der Walt et al. 2011 ) and Matplotlib ( Hunter 2007 ).