The 6-12 micron ISOPHOT-S spectrum of comet C/1995 O1 (Hale-Bopp)
This observation of Comet Hale-Bopp by ISOPHOT-S is discussed in;
"The infrared spectrum of comet C/1995 O1 (Hale-Bopp) at 4.6 AU from the Sun", Crovisier, J. et al.