Simulations performed to quantify the bias that can be introduced in the measurement of vmax. Plotted are the 100 folded rotation curves computed with random numbers distributed as a Gaussian with width the typical errors of the target galaxies for that radius. Red squares and black dots are the left and right arms of the unfolded rotation curves, respectively. The thick black line is the mean vmax for all the simulations. The grey shaded area is the scatter for this mean.
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