The nuclear spectra have been extracted in windows of 0.2 arcsec for an optimized sampling (as this is the width of the slit in most cases), from a long-slit spectrum usually covering 52 arcsec.

We extracted only nuclear spectra wich we identified as being centered at the peak of the continuum emission. In the cases for which we could not identify a continuum source we did not extract 1d spectra. In the cases for which there were more than one continuum source we extracted the brightest one. Even in the cases for wich we did not perform any extraction the information on the 2d spectra are listed in the Mastertable.

After extracting the nuclear spectra obtained with different gratings (and eventually with different platescales) we have combined them in order to provide the largest possible wavelength coverage for each galaxy. The combination was performed using the task scombine in IRAF, with the the rejection algorithm avsigclip when three or more spectra were available and minmax when there were only two spectra. No rejection was used when only one spectrum was available. Prior to the combination, each extracted spectrum, wich was in units erg s^-1 cm^-2 Å^-1 arcsec^-2 was multiplied by a factor wich is the product of the slit width and plate scale in order to consistently provide, for each segment, the flux integrated in the extraction window. For exemple, for one segment with a slit of 0.2 arcseconds and platescale 0.024 arcsecond pixel^-1, the factor is 0.00488. For another segment with platescale 0.05 arcsecond pixel^-1, the factor is 0.01.

When more than one exposure for each spectral range (and with the same spectral resolution and orientation) was available, we constructed averages to improve the signal-to-noise ratio, eliminating also cosmic-rays and other defects when detected. The final spectra was obtained by combining the spectra covering different spectral ranges.

There are several spectra obtained with the highest resolution grattings wich cover a short wavelength range. In many case there are a sequence of such spectra obtained at adjacent slit positions, apparently for kinematic studies. In these cases, we did not combined the spectra but provid 1d extractions we can be recovered as a tar file.