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We present a fast and portable re-implementation of Piskunov and Valenti'soptimal-extraction algorithm (Piskunov & Valenti, 2002} in C/C++ together withfull uncertainty propagation, improved cosmic-ray removal, and an optimalbackground-subtraction algorithm. This re-implementation can be used with IRAFand most existing data-reduction packages and leads to signal-to-noise ratiosclose to the Poisson limit. The algorithm is very stable, operates on spectrafrom a wide range of instruments (slit spectra and fibre feeds), and has beenextensively tested for VLT/UVES, ESO/CES, ESO/FEROS, NTT/EMMI, NOT/ALFOSC,STELLA/SES, SSO/WiFeS, and finally, P60/SEDM-IFU data.

publications of the astronomical society of the pacific

A fast and portable Re-Implementation of Piskunov and Valenti's  Optimal-Extraction Algorithm with improved Cosmic-Ray Removal and Optimal Sky  Subtraction