Extended D2CO emission: The smoking gun of grain surface-chemistry C. Ceccarelli, L. Loinard, A. Castets, A. G. G. M. Tielens, E. Caux, B. Lefloch and C. Vastel A&A, 372 3 (2001) 998-1004 Published online: 15 June 2001 DOI: 10.1051/0004-6361:20010559