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tokens: We thank the SOFIA ground crew, flight crew, and Mission Operations for their successful execution of the SOFIA observations. We also thank an anonymous referee for making suggestions that led to the improvement of this paper. This work is based on observations made with the NASA/DLR Stratospheric Observatory for Infrared Astronomy (SOFIA). SOFIA science mission operations are conducted jointly by the Universities Space Research Association, Inc. (USRA), under NASA contract NAS2-97001, and the Deutsches SOFIA Institut (DSI) under DLR contract 50 OK 0901. Financial support for FORCAST was provided to Cornell by NASA through award 8500-98-014 issued by USRA. This work is based on observations made with the Spitzer Space Telescope , which is operated by JPL/Caltech under NASA contract 1407. This work is based in part on observations made with Herschel , a European Space Agency Cornerstone Mission with significant participation by NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. R.D.G. acknowledges support from NASA and the United States Air Force. Facilities : Spitzer , SOFIA , Herschel .