ner_tags: O O B-Person I-Person I-Person B-Person I-Person O B-Telescope O O O O O O O O O O O O O O O O B-Telescope I-Telescope I-Telescope B-Telescope O O O O O B-Organization I-Organization I-Organization O B-Observatory I-Observatory I-Observatory O O B-Observatory I-Observatory I-Observatory O O O O O B-Observatory O O O B-Observatory I-Observatory I-Observatory I-Observatory O O B-Proposal O O O O O B-Grant I-Grant I-Grant I-Grant I-Grant I-Grant B-Grant O B-Organization B-Location
tokens: We thank Carlos de Breuck, Katharina Immer and APEX operators for their support for the observations. We also thank the referee for helpful comments. The Atacama Pathfinder EXperiment (APEX) is a collaboration between the Max-Planck-Institut für Radioastronomie, the European Southern Observatory, and the Onsala Space Observatory. Based on observations made with ESO Telescopes at the La Silla Paranal Observatory under programme 60.A-9341A. We acknowledge financial support from “Programme National de Cosmologie and Galaxies” (PNCG) of CNRS/INSU, France.