|Space Telescope Science Institute|
|COS Instrument Handbook|
13.3 For each COS grating, we present the resolving power, dispersion, plate scale, the wavelength range covered at each central wavelength setting and FP-POS position, sensitivities, effective areas, and a tool for estimating S/N. Advice on use is provided where appropriate.Note that the quoted sensitivities are estimates for mid-Cycle 22 (April 2015). The COS ETC will be updated as the instrumental sensitivity evolves. Users should be aware that the BOA is not well calibrated below 1200 Å.