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We investigate the dispersion which would be introduced into the Tully-Fisher distance indicator relation if a redshift-space artifact is mistakenly used for calibration. We use a standard spherical accretion model of the Virgo region and choose as our calibrating ``group'' an artifact which strongly resembles the Virgo Southern Extension. We find that the dispersion which results from ``group'' members actually being at different distances is comparable to values currently quoted for the Tully-Fisher relation.
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