C2 emission features in the Red Rectangle - A combined observational/laboratory study N. Wehres, C. Romanzin, H. Linnartz, H. Van Winckel and A. G. G. M. Tielens A&A, 518 (2010) A36 Published online: 31 August 2010 DOI: 10.1051/0004-6361/201014475