PACS Evolutionary Probe (PEP) – A Herschel key program D. Lutz, A. Poglitsch, B. Altieri, P. Andreani, H. Aussel, S. Berta, A. Bongiovanni, D. Brisbin, A. Cava, J. Cepa et al. (28 more) A&A, 532 (2011) A90 Published online: 28 July 2011 DOI: 10.1051/0004-6361/201117107