PAH emission variations within the resolved starbursts of NGC 253 and NGC 1808 L. E. Tacconi-Garman, E. Sturm, M. Lehnert, D. Lutz, R. I. Davies and A. F. M. Moorwood A&A, 432 1 (2005) 91-103 Published online: 22 February 2005 DOI: 10.1051/0004-6361:20035738