Visible spectra of studied V-type candidate asteroids (grey points). The red and green lines represent reflectance gradient fits used for the computation of the Slope A and Slope B parameters. We also plot the average spectrum corresponding to the V-type taxonomic class and its standard deviation (in blue) as defined by DeMeo et al. (2009). In some cases, average R-type (in orange) or S-type (in brown) spectrum from DeMeo et al. (2009) are also plotted for comparison.