Distribution of maximum nominal sigma values and its %T bias obtained from the 1000 isotropic Monte Carlo simulated samples of the σ_v − T relation. Shaded contours represent 68%, 95%, and 99% confidence levels. The value obtained in the real data is shown by a black dashed line on the histograms and by a point on the contour plot. The p-value in the histogram of maximum nominal sigma values represents the probability of getting higher nominal significance than the real data.