An emission plateau from 15 to 20 $\mu$m
C. Van Kerckhoven, S. Hony, E. Peeters, A. G.G.M. Tielens, L. J. Allamandola, D. Hudgins, P. Cox, P. R. Roelfsema, R. Voors, C. Waelkens, R. Waters, P. R. Wesselius;
2000, in preparation