The transmission curve was generated by Steve Lord at JPL using his ATRAN program ("A New Software Tool for Computing Earth's Atmospheric Transmission of Near- and Far-Infrared Radiation", NASA Tech Memorandum 103957, Ames Research Center, Moffett Field, CA, Dec 1992). The relavant physical parameters for this run:

• Standand atmosphere of mixed gases.
• 3mm of H₂O towards zenith.
• Airmass = 1.2 (zenith angle = 32.56 degrees)
• 2 atmosphere layers.
• Gaussian instrument profile.
• 5 data points per spectral resolution element.
• Altitude of 4232 ft.
• Spectral resolution of 0.005 um (R=200 at 1 um).