Bivariate Nadaraya-Watson regression estimator of stellar vertical velocities as a function of Galactocentric radius, using a bandwidth of h = 0.5 kpc. The same regression bandwidth has been used for the data (red), the no-warp model (black) and warp model of Yusifov (2004) (blue). The 95% bootstrap confidence band is shown for the data. For each of the two models, the non parametric regressions are performed for 20 simulated catalogs, obtaining the curves as the mean values and the shaded areas as the 95% uncertainty.
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