Two-dimensional metallicity distribution of the ionized gas in NGC 628 and NGC 6946 B. Cedrés, J. Cepa, Á. Bongiovanni, H. Castañeda, M. Sánchez-Portal and A. Tomita A&A, 545 (2012) A43 Published online: 04 September 2012 DOI: 10.1051/0004-6361/201219571