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The KPNO two-dimensional spectra were bias subtracted and flat-field
corrected. We then use the IRAF software
routines IDENTIFY, REIDENTIFY, FITCOORD, TRANSFORM to do the
wavelength calibration and the correction for distortion and tilt for
each frame. Then the one-dimensional spectra were extracted from each
frame using the APALL routine without weighting. For all objects we
extracted the brightest part of the galaxy covering a spatial size of
7. All extracted spectra from the same object were then
co-added. Cosmic ray hits have been removed manually. To derive the
instrumental response function, we have fitted the observed spectral
energy distribution of the standard star Feige 34 with a high-order
polynomial.