DPR CATG = SCIENCE, DPR TYPE = OBJECT,OzPoz or OBJECT,SimCal

Raw science frame

Recipe. A science raw file is pipeline-processed by the pipeline recipe flames_obs_scired. In short, the bias level and the interorder background are subtracted. Every order of the spectrum is extracted, flat-fielded, de-convolved for fibre cross talk, wavelength calibrated, and corrected for differences in fibre transparency. Finally, the orders are merged.

Extraction. The UVES-MOS pipeline knows two extraction modes:

• optimum (OPT)
• average (AVG)

Optimum extraction is the default extraction mode. It provides an optimized signal-to-noise ratio. Average (or standard) extraction is an alternative mode which simply averages any signal along the slit and above the sky background level. It may be a good choice in case of failure of the optimum extraction, e.g. at high exposure level. More information about optimum extraction can be found on the UVES sciende recipe pages.