The Following text was taken from the ESA Science site: URL: http://isowww.estec.esa.nl/science/
SWS spectrum of the galactic center. The aperture size used changes at 12.25, 27.5 and 29.5 microns
This spectrum was taken from the ISO dedicated Astronomy and Astrophysics Letter; "SWS observations of the Galactic center" , D.Lutz.
INFRARED PROCESSING AND ANALYSIS CENTER