Opening PANDORA’s box: APEX observations of CO in PNe L. Guzman-Ramirez, A. I. Gómez-Ruíz, H. M. J. Boffin, D. Jones, R. Wesson, A. A. Zijlstra, C. L. Smith and Lars-Åke Nyman A&A, 618 (2018) A91 Published online: 15 October 2018 DOI: 10.1051/0004-6361/201731912