Are data from all Keck instruments available in the KOA?
No. The KOA is currently only archiving and serving data from the High Resolution Echelle Spectrograph (HIRES). Data from other Keck single-aperture instruments are not currently available. Data from the Keck Interferometer (KI) are available through the NExScI KI Support page. • What type of data are available? KOA serves the raw data including all calibration files necessary to reduce the raw data, and extracted spectra for the majority of the science data. The extracted spectra are flat-fielded, bias-subtracted, and wavelength calibrated data intended primarily for quick data quality assessment. For more information about extracted spectra go to the Extracted Spectra section. • What are metadata? Metadata are data which are used to describe the parameters of a given file and are used to search for data files. The metadata are derived from the FITS header keyword information. The HIRES metadata consist of two parts: the native keywords from the original primary header unit written by
