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| Actual atmospheric transmission observed at the RLT site on a very good day. Four high frequency windows are visible: the 850 GHz window (approximately 800-950 GHz), 1.03 THz window (1.00-1.07 THz), 1.3 THz (1.25-1.4 THz), and 1.5 THz (1.45-1.58 THz). The peak terahertz transmission observed at Sairecabur is higher than at any other well-characterized submillimeter site, although these windows are also frequently seen at the South Pole and 40 kilometers south at the ALMA site. Many common and uncommon lines are also plotted. The atmospheric transmission spectrum was obtained using a zenith-looking Fourier-transform spectrometer (see Paine et al. 2000, PASP, 112, 108). |