CASOTS-II blackbody system. See: Donlon, C. J., W. Wimmer, I. Robinson, G. Fisher, M. Ferlet, T. Nightingale, B. Bras, 2014: A Second-Generation Blackbody System for the Calibration and Verification of Seagoing Infrared Radiometers, J. Atmos. Oceanic Technol., 31, 1104–1127, doi http://journals.ametsoc.org/doi/abs/10.1175/JTECH-D-13-00151.1