  We present the extraction and processing of the IUE Low Dispersion spectra
within the framework of the ESA ``IUE Newly Extracted Spectra'' (INES) System.
Weak points of SWET, the optimal extraction implementation to produce the
NEWSIPS output products (extracted spectra) are discussed, and the procedures
implemented in INES to solve these problems are outlined. The more relevant
modifications are: 1) the use of a new noise model, 2) a more accurate
representation of the spatial profile of the spectrum and 3) a more reliable
determination of the background. The INES extraction also includes a correction
for the contamination by solar light in long wavelength spectra. Examples
showing the improvements obtained in INES with respect to SWET are described.
Finally, the linearity and repeatability characteristics of INES data are
evaluated and the validity of the errors provided in the extraction is
discussed.
