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Applying a three-dimensional bisector method of regression analysis to a sample of ~100 spiral galaxy disks that span more than four mag arcsec^{-2} in central disk surface brightness yields v_{rot} ~ I_0^{0.50+/-0.05}h^{0.77+/-0.07} (B-band) and v_{rot} ~ I_0^{0.43+/-0.04}h^{0.69+/-0.07} (R-band). 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