E. Oliva acknowledges the partial support of the Italian Space Agency (ASI) through the grant ARS-98-116/22. We thank Henrik Spoon for help with the ISOPHOT-S data. SWS and the ISO Spectrometer Data Center at MPE are supported by DLR (formerly DARA) under grants 50-QI-8610-8 and 50-QI-9402-3.
© European Southern Observatory (ESO) 1999
Online publication: March 1, 1999