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All results presented below have been obtained by observations with
the Russian 6m telescope, mainly in the snap-shot mode during 4 runs
between December 1998 and February 2000. The spectrograph SP-124 attached to
the Nasmyth-1 focus of the telescope was used during the first run.
We used a grating with 300 grooves/mm (see log of observations
in Table 2) and a long slit of 240.
The scale along the slit was 0.4/pixel.
The Long-Slit Spectrograph (LSS in Table 2) (Afanasiev et al.
[1995]) attached to the telescope prime focus was used during
the remaining 3 runs. Most of the long-slit spectra
(12-20180) were obtained with a grating of
325 grooves/mm, giving a dispersion of 4.6 Å/pixel. Additional data
were obtained with a grating of 650 grooves/mm giving a dispersion of
2.4 Å/pixel. The scale along the slit was 0.39/pixel. For
all observations we used the Photometrics CCD-detector PM1024 with
m pixel size.
Normally, short exposures were used (2-5 minutes) in order to detect
strong emission lines, to measure redshifts and make a first
classification. Reference spectra of an Ar-Ne-He lamp were recorded
before or after each observation to provide a wavelength calibration.
Spectrophotometric standard stars from Oke ([1990]) and Bohlin
([1996]) were observed for flux calibration at least twice a
night. All observations and data acquisition have been conducted
under the NICE software package by Kniazev & Shergin (1995) in
the MIDAS
environment.
Part of the second priority candidates was observed with the 2.2m telescope on Calar Alto in June 1999. These observations will be presented in a forthcoming paper, although we will make use of the results in our analysis below.