Take a series of standard-star observations and extract and file a standard-star spectrum. This recipe is designed for use when an offset sky position has been used. The frames are subtracted in pairs, giving a sky-subtracted spectrum, which is extracted using optimal extraction. The spectral type and magnitude of the star is obtained from the Simbad database. The resulting spectrum is divided by a black-body spectrum of the appropriate temperature and filed as a calibration frame.
ORAC-DR -- integral field spectroscopy data reduction