Fig. 4
Average vertical velocity using PPMXL data, including the correction for systematic errors of the proper motion, as a function of Galactocentric Cartesian coordinates x, y (the position of the Sun is x = 8 kpc, y = 0) for different ranges of z. Only bins with error bars lower than 50 km s-1 are plotted; black indicates larger errors or absence of data.
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