Disclaimer: The information given here refers to the use of this recipe during QC processing. For more details see the pipeline manual at
the pipelines page.
Description: The spectra are bias- or dark-corrected. The order table is used to locate the inter-order regions where the background is fit with a polynomial, which is then subtracted from the data. The frame is flat-fielded. The sky is not subtracted. The data are the transformed into a 3D cube (see manual for details) and the object is traced along the three slices.