Rapid angular expansion of the ionized core of CRL 618 D. Tafoya, L. Loinard, J. P. Fonfría, W. H. T. Vlemmings, I. Martí-Vidal and G. Pech A&A, 556 (2013) A35 Published online: 22 July 2013 DOI: 10.1051/0004-6361/201321704