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Data reduction

The data reduction was done at SAO with the IRAF and the MIDAS software packages. In all details of the reduction process and the measuring of line parameters we followed the procedures described in PaperIII. Since we present a substantial number of objects with redshifts known from earlier publications, we could independently test the quality of our wavelength calibration. The results of these tests indicate that our internal errors $\sigma_V$ shown in Table 3 are close to the external errors and do not change from run to run.