Herschel-PACS observations of far-IR lines in young stellar objects - I. [OI] and H2O at 63 μm P. Riviere-Marichalar, B. Merín, I. Kamp, C. Eiroa and B. Montesinos A&A, 594 (2016) A59 Published online: 13 October 2016 DOI: 10.1051/0004-6361/201527829