Upper panel: distribution of our high-velocity stars as defined in Fig. 7 in a Hertzsprung-Russell diagram (symbols with blue error bars). For comparison the distribution of all RAVE stars (gray contours) and an isochrone of a stellar population with an age of 10 Gyr and a metallicity of −1 dex (red line) is also shown. The two green symbols represent two stars that were excluded from the samples because of their peculiar locations in this diagram. Lower panel: metallicity distribution of our high-velocity sample (blue histogram). The black histogram shows the metallicity distribution all RAVE stars.