“…The total peak-to-valley wave front error in transmission through the window over any 15 cm diameter aperture does not exceed k/7 where the reference wavelength is 632.8 nm. The window has >90% transmission at the wavelengths 400-750 nm, >50% transmission between about 310-400 and 750-1375 nm, and 40% transmission between 1386 nm and 2000 nm (Runco et al, 1999). The window has a 51 cm diameter aperture, allowing a view of 39.5°forward along the axis of the ISS, 32.2°aft, and 79.1°to port.…”